Nabble - Yukon GIS Users Group

Photogrammetry & LiDAR Services

2009-07-30T23:39:39Z

Dear Friends

Iam Babu from Geofiny Technologies Pvt Ltd, Chennai

Geofiny provides Geomatics services in the areas of Digital Photogrammetry, LIDAR Remote sensing, Geographic Information System (GIS), Global Positioning Services, Image Processing and CAD applications.

We carry out all data processing jobs for our clients at US, with highest quality and security standards, at competitive rates.

We are also developing a GSM based Automatic Vehicle Location system for fleet management using GPS/GIS.

Geofiny an ideally suited reliable outsourcing partner since our Engineers are trained to work extensively in a variety of Geomatics platforms. With this background we are sure you would understand that we could offer all geomatics services at a competitive cost but without sacrificing on quality.

Besides the already established clientele we are also looking forward to expand our services in US,Canada and other parts of the world through establishing prospective partners to source projects, technology solutions and customers.

We start off by doing a pilot job free of cost. On doing so we try to understand the clients requirements better in terms of quality and time. We would be highly interested to carry out any similar type of work from your end.

We would also be highly interested to venture into mutually beneficial Global partnerships & consortiums.

If any members needs Geomatics services kindly contact in the email elangobabuc@geofiny.com or +91-44-24501808

Thanks & Regards
Babuhttp://www.geofiny.com GTPL+2009.rar

adding Yukon projections to ArcView3

2007-09-04T17:10:04Z

How to add common projections used in the Yukon to ArcView 3's default projection list:

Edit C:\ESRI\AV_GIS30\ARCVIEW\ETC\DEFAULT.PRJ and insert the following between the lines "/2.1" and "(CooSys.1":

/2.1

(CooSys.99
	Name:		"Yukon Projections"
	Default:	9901
	Projections:	9901
	Projections:	3007
	Projections:	3008
	Projections:	3009
	Projections:	3010
)
(Albers.9901
	Description:	"Albers Equal-Area (Yukon)"
	Ellipsoid:	1003
	Lambda0:	-2.31256125889177
	Phi0:	1.02974425867634
	Phi1:	1.07628637206342
	Phi2:	1.18682389135578
	FalseEasting:	500000.00000000000000
	FalseNorthing:	500000.00000000000000
)

(Prj.99110
	Description:	"Projections of the World ; Geographic Decimal Degrees"
	Ellipsoid:	1000
)

(CooSys.1 Name: "Projections of the World" ...etc.

Here is the result: DEFAULT.PRJ

Explanation

"CooSys" defines a Category (the first drop down list). "Projections" lists the projections within the category, and can be defined anywhere within the file. The 3000 series simply include the standard NAD83 UTM projections defined lower down. This is why we only need to add one custom projection, namely "Albers.9901". The custom Geographic one shewn is not necessary, but I added it in anyway in order to show a more descriptive note. No I don't know what the Lambda and Phi numbers mean. To get those I defined a view projection the long way (view > properties > projection > custom ....), saved to an .apr and inspected it.

Are You Really Mapping Submeter?

2007-08-15T17:13:34Z

In an unrelated research project, I run across the great presentation from Joel Cusick of the US National Park Service. Ignore the slides for the most part and read the notes, that is where the real meat is.

Submitted Title: Submeter Mapping…Really? The Revenge of the Shift

Submitted Abstract:

Using a Global Positioning System (GPS) receiver has never been easier. Accuracies claimed by various receiver manufacturers can be verified, and under good GPS conditions, mapping grade GPS can easily map at the submeter range, while recreational autonomous GPS can exceed the accuracy of the typical USGS topographic quad. Where most of the mistakes are made is when basic fundamental field practices are disregarded and when the importance of geodetic datums are ignored. Have you ever run aground on a datum mismatch either in the field or in the GIS? This talk re-emphasizes the importance of some basic field techniques, regardless of the receiver make or model and controlling the dark side of GPS – datums and reference frames. Using a quote from Yoda, fictional character from Star Wars - “Happens to every guy sometimes this does”.

AreYouReallyMappingSubmeter.mht - all in one compiled Windows html file

the original presentation: http://www.nps.gov/gis/gps/AreYouReallyMappingSubmeter.ppt

Re: which transform? use a picture!

2007-08-15T17:08:35Z

Note: the graphics only show the applicable regions for files distributed by ESRI US and ESRI Canada. The .gsb shift files available from the various provincial geodetic distributors are not represented.

caution with nad27 --> wgs84

2007-08-15T16:59:12Z

this additional note from Margaret Maher of ESRI US:

"I'm glad that you found information that helped you decide which geographic transformation to use in your area. Please keep in mind though, that I try to discourage people from using the NAD 1927 to WGS 1984 transformations, because these composite transformations are not particularly accurate, except within a very limited geographic area (the state of Kansas in the USA).

Having a graphic representation for the areas of use when selecting the correct Geographic Transformation to use is great. I'll have to check into the source for these, to see if we can copy them and use them in our Help documentation, or in some of our Knowledge Base articles."

which transform? use a picture!

2007-08-15T16:54:40Z

Thanks to the memory of a co-worker from another department, Julie Houle, my summary of which geotransform to use have been clearly elucidated in 3 graphics, which are attached. The maps are taken from the exercise package of Data Production and Editing Techniques[1].

If I'd had *that* my epic quest would have been answered in minutes instead of weeks. I'll forward it to ESRI tech support for the next confused technician who blunders in mumbling incoherently about witchy dahdum transphomayshuns. I guess this answers the question about whether ESRI tech support personnel take their own courses!

Oh, just in case you are wondering, those diagrams are worth 4,434 words (of the summary!), or almost 1500 words each. Expelliarmus!

Nad83ToWGS84.pdf
Nad27ToNad83.pdf
Nad27ToWGS84.pdf

Which Geographic Transformation to use for the Yukon?

2007-08-15T16:53:01Z

This is the story I shared with the user group (see July 2007 Summary) and a few others about my quest to *confidently* choose the correct transformation method.

Which Geotrans Summary

Dear ESRI-L,

A few weeks ago I embarked on what I thought was going to be a simple single afternoon question: what is the correct geotransform to use when going from Geographic WGS84 to Albers NAD83, in the region of Canada's Yukon Territory?

I'll spare you the ordeal of following the tortuous route I led, and get straight to the results, and then follow with some of the nitty gritty. In the words of Mark Twain, if I had more time I'd write a shorter letter!

SUMMARY

After removing the duplicates, the list of transforms for WGS84 to NAD83 is:

NAD_1983_To_WGS_1984_*

For methods 6,7,8 one must contact the regional authority to acquire the necessary .gsb files (see NTv2 heading below):

The best general NAD83 CSRS for all of Canada is: None, use NAD83(Original) instead (either _1 or _5).

For Northern Canada, there is no transformation available between the 2 datum because there were not enough points where both set of coordinates were available to calculate the differences.

The most important thing about selecting a datum transformation is to be consistent, and always use the same transformation when processing your data.

BUGS

DUPLICATE TRANSFORMS: In the ArcMap transformations dialog there are 13 transformations available, 5 if them with duplicate names. This is an acknowledged cosmetic bug, fixed in the forthcoming ArcGIS Desktop Service Pack 3. It doesn't matter which of the dupes is selected, the same transform is applied.

NO ERROR ON MISSING .GSB: the tools don't check whether the NTv2 files are there or not. As long as it sees the geotransform variable is using a value of 1 through 8 it carries on happily regardless. The Defect ID for this bug is CQ00248905 and it listed as a high priority to add a warning message.

Okay, you can stop reading now.

DETAILS

NTv2

The Canada National Transformation v2 downloaded separately from ESRI Canada are only for NAD27 to NAD83, not NAD83_CSRS and variants. http://www.esricanada.com/EN_support/1205.asp And yes although the description says 1974(!), this is really is the right stuff. The dates refer to 1974 and 1976(Ontario) defintion or readjustments of NAD 1927.

Regional NAD83_CSRS binary grid shoft files (.gsb)

The regional .gsb files for NAD83 to NAD83_CSRS are handled at the provincial level. Contact list at "Canadian Spatial Reference System, Provincial Contacts" at Natural Resources Canada, Geodesy Branch http://www.geod.nrcan.gc.ca/prov_contact/index_e.php

It sure would be nice at some point to have all of the regional .gsb files available from a central (authoritative) clearing house. Maybe now that geobase.ca is up and running at some future point that could happen, at least for the free distribution ones (Alberta, BC, Quebec, Saskatchwen).

ALBERTA

BRITISH COLUMBIA

http://aardvark.gov.bc.ca/apps/mascotw/convert.html

ftp://ftp.gdbc.gov.bc.ca/pub/world/NTv2.0/BC-Adjustment-Transformation.xls

MANITOBA

NEW BRUNSWICK

NOVA SCOTIA

http://142.176.62.104/sns_webclient/

PRINCE EDWARD ISLAND

QUEBEC

http://www.mrnf.gouv.qc.ca/produits-services/syreq/syreq.jsp

SASKATCHEWAN

REFERENCES & RESOURCES

Email & Phone:

> the "Geographic_transformations.pdf" and "PEgt_namewhere.doc"

Usually installed locally at "C:Program FilesArcGISDocumentationgeographic_transformations.pdf" There is an online knowledge base whitepaper of the same which may or not be as up to date: "ArcGIS 9 Projection Documentation" - http://tinyurl.com/2fz5w2

A key to using this document is look at the "Code" column. Transforms are listed multiple times as a single transform can apply to multiple regions. For example NAD_1983_To_WGS_1984_1 applies to all Canada as well as North America. The single transform however will always have the same code regardless of how many places it is applicable.

Also see the similar PEgt_namewhere.doc attached to "HowTo: Select the correct geographic (datum) transformation when projecting between datums", http://tinyurl.com/yustqo

XXXX: code columns don't match betwixt .pdf and .doc is this a problem?

The Grids and Datums column from PE&RS (Clifford J. Mugnier) contains articles written every month with a brief cartographic history of many countries around this world. For people working in countries without published cartographic information (at least published online), these articles can be very useful.
http://www.asprs.org/resources/grids/

ESRI Technical Articles:

"HowTo: Select the correct geographic (datum) transformation when

http://tinyurl.com/yustqo

http://www.epsg.org

http://tinyurl.com/2h3nzb

http://www.esricanada.com/EN_supportfaq/1262_6303.asp

http://tinyurl.com/23ztvn

http://tinyurl.com/ywsqns

http://tinyurl.com/27rary

Geodetic Branch, Natural Resources Canada

http://www.geod.nrcan.gc.ca/faq_e.php#a19

CONCLUDING THOUGHTS

This is not an exhaustive summary of all the transforms, though it has been at times exhausting. I only followed the thread far enough to answer my initial problem, namely which transform to use when going from WGS84 to NAD83 in north western Canada. I am by no means an authority on the subject and even now cannot state with absolute confidence I have arrived at an authoritative answer. I only know this is the best I've been able to achieve. Hopefully the base is solid enough for someone else to pick the remaining dangling threads and carry on, and fix the ones I've likely miswired too!

If you only read initial and concluding paragraphs: The most important thing about selecting a datum transformation is to be consistent, and always use the same transformation when processing your data.

Transformally yours,

--
matt wilkie

Geographic Information,
Information Management and Technology,
Yukon Department of Environment
10 Burns Road * Whitehorse, Yukon * Y1A 4Y9
867-667-8133 Tel * 867-393-7003 Fax
http://environmentyukon.gov.yk.ca/geomatics/

DNR Garmin and Yukon Albers Projection

2007-08-15T10:52:31Z

Getting a custom projection set in DNR Garmin can be a bit of a pain. Here's an easy way to add the Yukon Albers projection to the EPSG and/or ESRI lists. Open "c:\program files\dnrgarmin\proj\nad\epsg" (or esri) in your favourite text editor and add this to the bottom:


# NAD83 / Yukon Albers

<3578> +proj=aea +lat_1=61.66666666667 +lat_2=68.0 +lat_0=59.0 +lon_0=-132.5 +x_0=500000 +y_0=500000 +ellps=GRS80 +datum=NAD83 +units=m

Result:

After you've done that, go to File > Set Projection, using the the radio button pick which ever file you edited (epsg or esri), and in the POSC code drop-down select 3578. Thanks to the work of Jeff Hamm from the Yukon Land Use Planning Council after the next release of DNR Garmin (and any other software which uses the EPSG database) the editing step won't be necessary, as "3578 Yukon Albers" is now in the core database.

July 2007 Summary

2007-08-01T16:54:33Z

I've prepared a pretty text version of this, here: Yukon+GIS+Users+Group%2C+July+2007.doc unfortunately there doesn't seem to be an easy way to copy and paste the images into this Nabble editor so you'll just have to go through the extra step, sorry. -matt

Yukon GIS Users Group, July 2007

This missive is partly minutes of the last meeting, with a smattering of what matt thinks is cool or new since we last talked.

Present: Adam, Amy, Aubrey, Bailey, Diedire, Matt, Meila, Manon, Olwyn.
Minute Maker and Chair of Next Meeting (a.k.a. the sacrificial goat): Matt

Oh GPS App, Where Art Thou?

A brief and inconclusive survey of what applications people are using for GPS integration with their primary GIS wares. Amy needs a seamless method for bringing in field data to the central data store which doesn’t need any ESRI licenses.

DNRGarmin – free, stable, been around a long time and still being developed

MxGPS – relatively cheap, smooth worklflow

Map Product Creator– from Garmin, expensive, problematic for some things. It’s impossible to find on their website so no link here.

Plus a handful of other free/open source applications which can be chained together (cgpsmapper, gpsupload, gpsbabel,…). When in doubt, put on your “protect my squinty eyes” glasses and go to http://gpsinformation.net/

Peter Von Gaza is writing a cool interactive program which shows the gps points along with their error elipses, in 3D no less. Diedre is the only to have seen it so far. No word on when/if it might be done.

Matt to send Olwyn the name of the program Environment is/will-be using.
Pssssst! Olwyn, It’s mxgps.

Manon is seeking standard attribute names for downloaded GPS data. What are other people, departments, governments using? ‘twas the general consensus that “we don’t know”. Matt suggested looking at Alaska GPSToolkit. Later research shows that is no longer developed, but there is the US National Park Service gps4gis which has a wealth of information. Another suggestion is the BC Integrated Land Management Bureau (yet another government agency which keeps changing it’s name).

IMF and ArcIMS

What up with that? ArcIMS is being end of lifed in favour of ArcGIS Server, well as much as ArcView 3 has been, so what does that mean for the Internet Map Framework?

There was some chatter, with no clear information or decisions. Later in the month we came to:

[Diedre] …I expect Geomatics Yukon will support and review this technology as required. … Interested parties in ArcGIS Server can contact Geomatics Yukon to start discussions. [in October]

[Amy] …Doug Cates, [primary author of IMF] believes his IMF will die out with IMS but Geocortex has started planning …there will be an additional cost associated with moving to Geocortex… ArcGIS Server on it's own might be all that is needed…

Oh woe is me.

Amy brought to a light a pernicious and subtle bug: when using the Union tool one can get duplicate polygon geometry. She has python script which fixes it, but it is very slow. There is a 3^rd party tool to do the same, but it’s $$. AV3 has a simple 1 button fix, but it’s a workflow pain to flip back and forth (and it shouldn’t be happening in the first place). It was suggested she share the py script around and see if anyone has ideas for optimising it. No one bugged her about it though so that didn’t happen, and it was such a useless program she deleted it rather than have it clutttering up here space. Finishing thought: Everyone check your data!

Matt shared a long document which no one will ever read to the end, much less take the time to understand, about the trials and tribulations of which #$%@ datum transformation parameter to choose when confronted with ArcGIS dialog for same and dealing with Yukon data. Short answer: pick #1.

ESRI User Conference in San Diego

So Manon, how was it?

Oh wow. Overwhelming. Awesome. 75 choices for what to see, every hour.
Best things: contacts with other users and experts, the GDB design workshop, “Canada Night” party, exposure to all the different fields and people. The demo of the Penx. Everyone should go!

Diedre: just the stats ma’am!

Diedre is happily ensconsed in her new gig with Statistics Yukon as their premiere (the first, the only) GIS person. She’ll be even happier when she gets a computer! Ping pong is a hot item there, so don’t show up at lunch time unless your willing to be drafted and pelted (paddled?).

News

Yoohoo! Yukon Albers projection is now in listed in the EPSG Geodetic Parameter Dataset. The magic number is 3578. Now instead of having to remember multiline proj4 or ESRI codes we can just slap in "EPSG:3578" (well, after the downstream applications have upgraded to current epsg db anyway). Thank you Jeff Hamm for spinning the bureaucratic wheels that enabled this!

ArcGIS Service Pack 3 is out; local mirror in the usual place. I’ve only just started going through the fixed and added lists but so far I don’t see any of our own issues in there. The list of things fixed is impressive though.

GeoCommons – an interesting new entry into the interactive online maps arena. Their claim to interest, at the moment, is “heat maps”, and being open for users to freely upload gigabytes of data, and most interestingly, creating their own maps. The heat maps are pretty cool, but I see problems of scale and interpretation (something that looks hot-hot-hot at continental view is only so-so at regional level). It’s interesting to me that most of the user-generated maps so far are based on social equality issues. Where is steroid use most prevalent? And, Foreclosure filings and the subprime collapse for example.

Hey What’s That? Have you ever wanted to know the name of the mountain peaks in the distance? Or calculate the profile between here and there? Now you can, on top of Google Maps of all things. Too bad the elevation data stops at 60° north. I offered the all of Canada elevation model to them, but no reply. Sigh. Anyway, here’s Theresa Island, in Atlin Lake. The vertical exagerration is too much for this area, but click around a bit on the top squiggly bit anyway. For fun, figure out how you might be able to accomplish the same thing with that $5,000 piece of silicon and gold and tin and who knows how many toxic unmentionables under your desk along with the additional $15,000-20,000 worth of software running on it. Okay, got that solved? Now remind yourself that this is a freakin website.

Update on the Penx: apparently this company is just one of many using this technology. Their claim to fame is not the pen so much as the integration with ArcMap. Getting an answer out of the company is difficult. Likely they are swamped with requests from the UC. Look around before buying into one company/offering. The technology company behind it is Anoto, with end user hardware available from the likes of Logitech, Nokia and Maxell. Before you get too excited though, and if you like to hang on the promise of vapour-ware, check out LiveScribe (which I discovered courtesy of Loose Wire blog).

Most interesting new open source GIS tool: Kosmo. Don’t get scared off by the spanish, or the fact that it is java based and buggy as it is still worth a look (topology and geoprocessing wizards). No project on the fly though (for that see QGIS).

-- matt wilkie -------------------------------------------- Geographic Information, Information Management and Technology, Yukon Department of Environment 10 Burns Road * Whitehorse, Yukon * Y1A 4Y9 867-667-8133 Tel * 867-393-7003 Fax http://environmentyukon.gov.yk.ca/geomatics/ --------------------------------------------

Re: One To Many Labels

2007-05-22T15:19:31Z

your memory serves you well Eric, thanks!

One To Many Labels

2007-04-09T12:27:20Z

Matt... if my memory serves me (which it often doesn't), were you looking for One To Many Labels functionality aeons ago? Here it is, in the EDN.... http://tinyurl.com/2pkfqs

I haven't tried it out myself, but it should work in principle(!).

Great news about the free NTDB, btw.

Eric

NTDB now FREE!

2007-04-04T11:30:50Z

Hello Folks, Good news!

"Important Notice -- Take note that the NTDB, CanImage and CanMatrix products will now be available at no cost only at the GeoGratis website." http://www.cits.rncan.gc.ca/cit/servlet/CIT/site_id=01&page_id=1-004.html

Note that the free CanMatrix available on the same server is only the half-resolution version (160dpi). The 300dpi is still for sale only and restricted distribution. A tip though, if you want the 300dpi buy it from http://www.softmaptech.com/ for a fraction of the cost from NRCAN (with collars clipped to boot). Rumour has it that in a year or two the restrictions will be lifted here too.

If you already know what you're looking for, skip the 20-clicks interface at http://www.geogratis.ca/geogratis/en/index.html and dive straight into ftp://ftp2.cits.rncan.gc.ca/pub/geogratis/bndt/

A command like this will grab all of the 250k 105 series in one go:
[windows, with cygwin tools in path; double up % to put in a batch file]

wget --continue --recursive --level 2 ftp://ftp2.cits.rncan.gc.ca/pub/geogratis/bndt/250k_shp_en/105/*

Then unpack:

cd ftp2.cits.rncan.gc.ca\pub\geogratis\bndt\250k_shp_en\105\
for /r %f in (*.zip) do unzip -d . %f

and mush together with OGR goodness (orders of magnitude faster than ArcGIS FeatureClassToXXX):

mkdir merged
for %f in (*wetland*.shp) do (
( if not exist merged\wetlands.shp ogr2ogr -f "esri shapefile" merged\wetlands.shp %f ) else (
ogr2ogr -f "esri shapefile" -update -append merged\wetlands.shp %f )
)

Enjoy!

-matt

41st Annual Alaska Surveying and Mapping Conference

2007-03-06T09:38:26Z

GIS Sessions Announcement
41st Annual Alaska Surveying and Mapping Conference
Reconverging on the North: In Celebration of the International Polar
Year
19-23 March 2007
Fairbanks, Alaska

For further information, please go to:
http://www.aksmc.org/

or contact:
Hilmar Maier
Institute of Arctic Biology, University of Alaska Fairbanks
Phone: 907-474-1540
E-mail: fnham@uaf.edu

--------------------
GIS Jam Sessions will be a featured component of the 41st Annual Alaska
Surveying and Mapping Conference (ASMC) being held on 19-23 March 2007,
at the Westmark Hotel in Fairbanks, Alaska. The sessions are sponsored
by the Alaska Arc User Group and relate specifically to geographic
information systems and will include four-day GIS technical sessions and
several pre- and post-conference GIS training courses.

The University of Alaska Fairbanks is jointly sponsoring events at ASMC
to kick off the International Polar Year. Co-hosting the conference are
the Alaska Region of the American Society for Photogrammetry and Remote
Sensing, Alaska Section of the American Congress on Surveying and
Mapping, Alaska Society of Professional Land Surveyors, and Alaska
Chapter of the Urban and Regional Information Systems Association.

To register for the conference, sign up for the GIS sessions and
courses, and view the agenda, please go to:
http://www.aksmc.org/

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Mapdex Toolbar for ArcGIS

2007-03-01T11:51:53Z

http://www.mapdex.org/MapdexToolbar/ - brings the mapdex.org search to ArcMap, a global index of 2,252 servers, serving 38,135 map services, containing over 400,000 GIS Layers, covering more than 4,000,000 columns! With the toolbar you can search for GIS layers from ArcIMS mapservices and add them to ArcMap.

Re: Editing web maps, someday

2007-02-23T13:36:31Z

Now there are innovative graphic web editing programs out there which are geographically aware. I highly recommend you go have a look at MapShaper, http://www.mapshaper.org/. The current demo "lets users upload and edit their own Shapefiles. Supported features include global simplification and individual vertex editing." What that blurb doesn't say is: a) you can upload your own shapefiles, up to 16mb, b) the simplification happens in front of you in realtime, so you can actually see how the various algorithms react differently and fine tune the generalisation you want (tip: use the slider at the bottom). Aside from the obvious things just mentioned, this particular application demonstrates something I've not seen anywhere, let alone in a web application.

I also forgot to mention in the first post that the framework used to develop Gliffy is open source, it's called Open Laszlo.

Editing web maps, someday

2007-02-23T13:04:03Z

there are so many cool new programs and services popping out the wood work it hard to know where to look next. Indeed I often find myself so busy watching what's new, I forget to finish what I'm doing now. :) There is a darkside to this fecundity though. I'm hesitant to invest any significant time or money into learning swishy new program X, because I just *know* that next week a couple of dudes in San Francisco are going to blow it all out of the water by changing the rules of the game, again.

So with that preface, what has knocked me on me kiester today? Gliffy, a web based application for drawing diagrams and flowcharts and network diagrams and even maps of a sort. Okay, so the cartographic tools are a little lacking, and the symbology is a trifle simplistic with strong tendencies to chart junk. But hey man, those can be refined. This is working in a browser, on Mac, Linux & Windows, no plugin install necessary (unless for you've managed to stay away from flash somehow). It has well integrated collaboration and versioning. (Versioning is cool. I think _everything_ should be versioned. Everything.)

Now you're probably thinking I'm drinking the koolaid and starting to fill out my commitment papers. That's okay, I've not lost it yet. I don't think Gliffy is going to find a place in my toolbox, but something else that looks much like it might. Do me a favour. Open up Gliffy in one browser window and fit to half your screen. Open up the latest and greatest internet map site with snazzy interactive editing tools[1]. Fill up the other half with a quick & dirty a Gliffy Yukon Map (login as bugmenot@mailinator.com, bugmenot. Now, which is the better tool from a "I'm just a user" perspective?

[1] Don't have one at hand? Try the Institute for Geographical Research & Education real time editing scripts for ArcIMS/ArcSDE demo
http://164.76.128.98/realtime/viewer.htm (IE only I'm afraid).

Re: segmentation violation

2007-02-14T15:06:52Z

Ahh ha ha ha....

You made me laugh out loud! Thanks for that!

Yeah I'll start reading up on that...sounds like a good settle-comfortably-in-your-chair-with tea sort of event....

Thanks,

Sarah

Re: segmentation violation

2007-02-14T13:38:06Z

ahhh, the infamous segmentation violation. It can mean just about anything, except for "I've accomplished what you asked of me my Mistress. What is your next command?".

The place to start troubleshooting is http://support.esri.com/index.cfm?fa=knowledgebase.techarticles.articleShow&d=15322

segmentation violation

2007-02-13T12:47:10Z

Hello there,

I've created a polygon shapefile in ArcGIS and put it into ArcView 3.2. I would like to do some analyses on it but whenever I go to use it in one of the extentions it says "Segmentation Violation". Is there something I could do (or haven't done) that can remedy the problem?

Thanks,
Sarah

Re: nearest distance without arc Info

2007-02-13T12:45:24Z

Thanks Matt,

I did send an email throught the ESRI forums.

Also I ended up just Exporting the geodatabase data then doing the nearest features ext. in ARCVIEW 3.2. Although it does take a while...30 minutes.

I have another question for you...

I've created a polygon shapefile in ArcGIS and put it into ArcView 3.2. I would like to do some analyses on it but whenever I go to use it in one of the extentions it says "Segmentation Violation". Is there something I could do ( or havnt done) that can remedy the problem?

Thanks,

Sarah

Re: nearest distance without arc Info

2007-02-07T09:20:22Z

I've not tried anything like that. Probably your best bet is to ask on ESRI-L (http://support.esri.com/index.cfm?fa=listserve.listserve) or the online forums (http://support.esri.com/index.cfm?fa=forums.gateway). Horrible as the forum interface is, it does get a lot of traffic.

Nabble archives for ESRI-L and ARCVIEW-L are at http://www.nabble.com/ESRI-L-f16835.html and http://www.nabble.com/ArcView-L-f16834.html though I haven't had much luck posting to the list via the Nabble posting service. What I do is subscribe to the lists from my gmail account, set up a filter to auto-delete incoming messages, read the lists via Nabble, and post from gmail. It's a roundabout setup but I find it easier than downloading all the messages to my local machine or trying to use gmail which is quite slow.

Good luck!

-matt

nearest distance without arc Info

2007-02-02T15:10:03Z

Hi there,

I'm trying to calculate the nearest distance from a polyline to the edge and center of a bunch of polygons BUT I don't have arcinfo. Is there a way to achieve this with only ARCGIS?

Thanks,

Sarah

Re: area of polygons

2007-01-10T09:26:40Z

Thanks alot!

ArcGIS service pack 1 for v9.2

2007-01-10T09:24:26Z

Here we are only having arcgis 9.2 for a month and the first service pack is out. :) The list of issues addressed is at http://downloads.esri.com/support/downloads/other_/ArcGIS-92sp1-issues.htm and as usual I've place a local mirror for the Desktop and Reader portions of the pack at ftp://ftp.geomaticsyukon.ca/Users/ArcGIS_ServicePack/. For SDE and others you'll need to see the ESRI Support site.

Re: area of polygons

2007-01-10T09:19:54Z

The units are based on the projection definition. For Yukon data in common use this pretty much always means metres.

area of polygons

2007-01-08T13:21:14Z

Hi there,

Just wondering...when using the identify tool on a polygon...and the box comes up with a few fields...how do you find out what the unit of measurement is for the area field?

Thanks,

Sarah

legend item not showing

2007-01-04T10:32:37Z

Hello there,

I have a layer called 2006 Surveys Sites with three associated unique values called Good Medium and Poor. When I am in layout view and want a legend the unique values show up but the title (2006 Survey Sites) does not.
How can I get the title back?

Thanks,

Sarah

printed copies of Handbook of Spatial Analysis now available

2006-12-12T16:27:36Z

Dear colleague

Thank you for registering your interest in the Handbook of Spatial Analysis using the http://www.spatial-literacy.org/ website.

The first edition of the Handbook has now been completed and published in printed, website and PDF formats. The printed version details are as follows:

M J de Smith, M F Goodchild, P A Longley (2007) "Geospatial Analysis: A comprehensive guide to principles, techniques and software". 414pp, Troubador, Leicester, ISBN: 978-1905886-60-9

Leaflet: A leaflet (pdf) describing the Guide, including details of size, contents, and pricing can be obtained by clicking here

Orders:

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PDF version (available very shortly): The PDF version provides full colour, searchable text, with embedded hyperlinks. Free updates will be provided in year 1. Orders may be placed by sending an email request to: contact@spatialanalysisonline.com - please provide your name, address for invoicing, order reference (if applicable), address for shipping (if different from invoice) and number of copies requested. Pricing is provided on the leaflet and is approximately 50% of the printed version. Orders will be fulfilled by a download link which will be supplied on receipt of payment. Payment instructions will be provided. Please note that PDF versions are subject to a licensing agreement whcih is available for download here. A CD copy can be provided by post on request.

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Enquiries: Enquiries regarding bulk orders and licensing subsections of the Guide for use in courseware should be made to: contact@spatialanalysisonline.com

Many thanks for your interest in our work

Best regards

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Re: sat image

2006-12-10T18:11:42Z

Well, not a good idea depends on how much time and disk space you have I suppose. I mean, I've downloaded the OnEarth Landsat 7 for the area so I guess you could say I thought it was a good idea! There's still a couple of dozen hours of work or more to put into it before it will be usable for making maps though.

As for downloading BMNG from http://www.nasa.gov/vision/earth/features/blue_marble.html see right hand side the heading "Download The Full Blue Marble Set", thence to "NASA Earth Observatory" and scan for the "Data Access" heading. From there you pick the month you want and the resolution and format. (the other servers listed likely work too, I've just not used them).

cheers,

-matt

yukongis.ca: still broken for updates

2006-12-10T18:00:15Z

http://yukongis.ca/bin/view - some might have noticed there has been no new content since August (no, really?) The proximate cause is that I’m getting internal server errors for any task which requires authentication. I’ve not had, or made, the time to look into it and fix it. I have many excuses: it’s too hard and slow to do a complete backup and upgrade over dialup, I’m not supposed to spend time at work on it, what’s the point nobody but me uses it, etc. The real reason is more like: Getting Things (not) Done, which will likely be my epitaph. “Matt, nice guy, but didn’t finish much”.

Anyway the point of this message is: no I've not abandoned it. I do intend to try and get to the bottom of what's broken and fix it, but I don't know when or how that will happen.

-matt

Re: sat image

2006-12-05T16:55:16Z

Hi MAtt,

Thanks.

Are you trying to say that a sat image that is 10's of gigabites in size is not a good idea to download?
Also, I went to the site and can't seem to find the image I am looking for... is there a special pathway to get to thelist of images available?

Cheers,

Sarah

Re: sat image

2006-12-05T16:41:06Z

Okay, now that I know what the intended use is, I can direct you specifically to the NASA Blue Marble Next Generation images: http://www.nasa.gov/vision/earth/features/blue_marble.html as a full resolution Landsat 7 image of AK/YT/NBC would be be 10s of gigabytes in size.

Re: sat image

2006-12-05T15:59:36Z

Hi Matt,

Thanks for the links.

I'll be checking them out. Yeah actually I've looked at the Yukon image and it's a Landsat 7 image. Can I get that one at the links that you gave me?

Yes I think I would need the actual polygons of these images, unless there is a landsat 7 image of Alaska, Yukon, NWT and BC. I plan to use it as a background for a simple Yukon map.

Thanks again.

Sarah

Re: sat image

2006-12-05T15:39:02Z

that's a big question Sarah. Which satellite are you looking for? Landsat 5, Landsat 7, Ikonos, MODIS, GOES-10, etc, etc.
And by shapefile do you mean polygons which delineate the extent of each scene (image), or are you looking for the actual images themselves?

In any case a good place to start is Geogratis for Canada, the Alaska Science Center for Alaska, and the NASA Jet Propulsion Laboratory for the world. I don't know if these are the best, they're just ones I'm familiar with.

http://geogratis.cgdi.gc.ca/geogratis/en/collection/search.do?search=product&product=eo.satellite&scale=
http://alaska.usgs.gov/science/geography/orthoimagery/index.html
http://onearth.jpl.nasa.gov/

cheers,

-matt

sat image

2006-12-05T14:47:36Z

Hello there,

Just wondering if anyone has access to shapefiles of satellite images of Alaska, Western NWT and Northern BC?

Thanks,

Sarah