7,399 reputation
660150
bio website djq.me
location Cambridge, MA
age
visits member for 4 years, 9 months
seen Jun 29 at 23:25

interested in postgis, geodjango, qgis, python and R

cofounder of coUrbanize

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Feb
19
answered How to define new custom projections in QGIS?
Feb
19
comment How to define new custom projections in QGIS?
Ah, that fixed it. I'll write an answer explaining that I should have clicked save before pressing ok
Feb
19
comment How to define new custom projections in QGIS?
No, I pressed ok. Oops, I will try pressing save and see if it shows up.
Feb
19
revised How to define new custom projections in QGIS?
added 101 characters in body
Feb
19
asked How to define new custom projections in QGIS?
Feb
18
accepted What does the code RTTYP represent in the USA Tiger road files?
Feb
18
comment What does the code RTTYP represent in the USA Tiger road files?
Looks like that is it - thanks!
Feb
18
revised What does the code RTTYP represent in the USA Tiger road files?
edited body
Feb
18
revised What does the code RTTYP represent in the USA Tiger road files?
added 249 characters in body
Feb
18
asked What does the code RTTYP represent in the USA Tiger road files?
Feb
17
comment Creating raster by randomly choosing cell value from multiple overlapping rasters?
hmm, good point @whuber. So what does it mean to exclude NoData? Is it just to make sure that they are not picked when randomly choosing?
Feb
17
comment Creating raster by randomly choosing cell value from multiple overlapping rasters?
I think you can create conditions using something like this in the raster calculator Con(IsNull(ras1), 0, ras2)
Feb
17
comment Display a WFS layer with OpenLayers
If you are using firefox I've found httpfox also useful for examining GET/POST commands. It has a little more detail than firefox for somethings: addons.mozilla.org/en-US/firefox/addon/httpfox Also, the javascript terminal in Chrome can give errors described slightly differently, which can be helpful.
Feb
15
revised How to install GDAL with TIFF support on Linux?
added 16 characters in body
Feb
14
comment How to split a polygon into multiple equal-width polygons in ArcMap 10?
Fishnet does exist in ArcGIS 10.
Feb
14
accepted How can I calculate the average width of a polygon?
Feb
14
comment Using SearchCursor to access & export values in a raster table
Hi Ryan - First, does an attribute table definitely exist? Secondly, does it have to be in arcpy? You can just try a simple export from the attribute table if you urgently need the data. Thirdly, are you reading in the raster properly? You can't read in the file using the name unless you set the working directly properly using something like env.workspace = r"D:\DATA\\", after the line from arcpy import env
Feb
14
comment How can I calculate the average width of a polygon?
Thanks Scro, it's not currently in PostGIS, but it's pretty quick to load in. I think I'll try @whuber's approach first but I will compare it to the results from PostGIS (and thank you for the offer of SQL help, but I should be able to manage). Mainly trying to get the approach clear in my head first.
Feb
14
comment How can I calculate the average width of a polygon?
that's true! In this case, my centerlines are not the same length, but I could always join them as one, and split them per polygon.
Feb
14
comment How can I calculate the average width of a polygon?
Thanks @whuber that is a great answer and it has helped me to think about it a lot more clearly.