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Sep
20
comment How can I effectively debug arcpy Python scripts?
+1 for the answer, and again, if I could, for including the string and not just an image (text is so much easier to copy and paste!).
Sep
19
comment For a ESRI Geodatabase Feature Class, which table holds the spatial reference?
if anyone really wants to know the table name, create a Personal Geodatabase, put some data into it, and then open mydata.mdb in MS Access or other tool which understands mdb's. (Ok, I just did it. It's called GDB_SpatialRefs)
Sep
15
comment Canvec Symbology in Arcgis 10?
@SaultDon, no I haven't. I should look at that more closely. I'm trying very to avoid things like merging as I'm trying to keep our datastore up to date with the twice annual Canvec release with a minimum of manual intervention.
Sep
13
comment How to generate world files for raster X?
so if I'd waited I day I could have saved myself a couple hours of work! but I wouldn't have learned anything, so I'll call it even. ;-) From reading the commit log, in addition to all the user interface goodness the what this qgis tool does better than mine is handle unicode filenames and writes an external esri-style .prj file. It doesn't do is follow the convention of naming the extension after the input, e.g. for a jpeg it writes .wld rather than .jgw, which may or may not matter to others. Accepting this as the correct answer even though I didn't use it, as it the most complete solution.
Sep
12
comment What Makes a Map be classed as Badly Designed?
I think the downvotes here are not because people contend with the central proposition, that any projection by it's very nature is "bad" in that it paints a distorted picture the real thing, but rather because that problem is not clearly explained here. Johan's point is strong: if you use a given projection outside it's domain, it is in fact a bad map. Just because everyone including giants like microsoft and google do it doesn't mean they're not committing fundamental mistakes. (and I'd argue they, or at least some of them, know it's a mistake, but there's value above and beyond the mistake).
Sep
12
comment What Makes a Map be classed as Badly Designed?
Mark Monmonier's how to lie book is certainly a classic and deserves to be widely read (and understood!). This answer however doesn't tell the reader what is wrong with the map depicted. The cutoff percentages are different, so what's wrong with that?
Sep
12
comment How to generate world files for raster X?
the software I'm preparing these for doesn't understand embedded georeferencing or external .prj (proj4 or wkt) files. It only looks at .wld (or .blw, .jpw,... etc.).
Sep
12
comment What are the FOSS equivalents to these ArcGIS products?
In my experience the only places of GIS activity where ESRI still indisputedly holds the high ground is cartography. I would love to see a combination of qgis and inkscape or scribus, and have had some success with a qgis+inkscape, but only with maps involving very few features and vertices (where "few" means in the thousands as opposes to tens or hundreds of thousands). A second area of preminence is cohesiveness. With arcgis, provided one has money, most everything is there. With floss one spends a lot of time on gluing things together. This is rapidly improving though, especially in qgis.
Sep
8
comment Converting huge geotiffs to tilepyramid
this is a borderline advertisement. To push it off the fence into a solid answer please summarize how one would use FME to produce tiles and link to documentation that covers the OPs issue directly rather than just the front page. Thanks.
Sep
8
comment Dimensional analysis/conversion problem: Map scale to image resolution (dpi)
which begs the question of: is native resolution actually necessary? Do you or your client have a device that can actually print that density? (all the same, thanks for the question and formula!)
Sep
8
comment Radio Propagation Modelling, from a GIS view point
Thanks! That's spot-on, "The goal of this paper was to introduce specialists in GIS and geographical databases to the problems of propagation prediction and radio-network planning for cellular radio communications" (Curious, Nitro pdf reader opens the document but only shows the figures, no text. Adobe ReaderX work fine.)
Sep
8
comment Radio Propagation Modelling, from a GIS view point
Yes I'm quite aware that people over there looking here are likely to be much more concerned about our radio savvyness ;-)
Sep
7
comment subtypes vs domains
this is a nice succinct definition of subtypes and domains, particularly domains, and I like that. When I read it there was an "Aha! now I get it" moment. However it shouldn't really be voted so high for this particular Q because it doesn't go to the root of the OPs problem, who already know s/he wanted Coded Value domains but had been unsuccessful in acheiving it.
Sep
7
comment Looking for an annotated vectorial map of the world
Please don't post simple one liners with links. They don't help anyone understand the utility of what's at the other end, and when, inevitably, the resource succumbs to link rot it just becomes dead wood to trip over. On the hand a link with a short summary of the destination and why it's relevant can remain useful long after the resource itself has moved or vanished.
Sep
7
comment Speed of various raster data formats
thanks! I folded the summary into the answer itself, so it's more self contained (see edit link at bottom left of each answer/question).
Sep
6
comment Speed of various raster data formats
+1 for the linked article, but the important info is offsite and will be lost to us if that page ever goes down or moves. I suggest giving a summary conclusion of the article so that in the event the page is not available, even momentarily, readers have something to work with for future research and thinking. Thanks!
Sep
1
comment Convert Lambert Conformal Conic to WGS84
instead of editing the epsg database, which will get overwritten on updates etc., save the projection info in a text file and call from command line with gdalwarp -s_srs my-custom-lcc.prj ...
Sep
1
comment Building GDAL With Read/Write Support of FileGDB
I think @Sean's comment is really an answer.
Sep
1
comment How to generalize coastlines?
If you just want to do a passable job and move on, @R Thiede's answer is probably the best place to start. If you want to work on the real challenge, simplifying linework without losing the meaning of the shapes, see the related questions gis.stackexchange.com/questions/38/… and gis.stackexchange.com/questions/440/….
Aug
31
comment How do I use sys.exit(0) in an arcpy script to exit early without having an error message show up?
thank you for posting concise code example which clearly illustrates the logic and leaves out the extras. +1