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  • 0 posts edited
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  • 22 votes cast
Aug
11
comment How to get geodetic area? rgeos::gArea doesn't seem to work. Or area-preserving projection
I don't think that's it - should be 9820. Also, equal area projections preserve area, not shape, some distortion from a Mercator is expected.
Aug
11
answered How to get geodetic area? rgeos::gArea doesn't seem to work. Or area-preserving projection
Aug
11
comment Major bug in ArcGIS Zonal statistics?
It would show up as a row in the attribute table
Aug
11
comment Major bug in ArcGIS Zonal statistics?
What value is used to represent NoData in this raster?
Aug
10
answered How to open/display and extract NetCDF files info?
Aug
7
revised ArcPy adds erroneous interior ring when writing adjacent, multipart geometry?
Got voted down so clarified a few points
Aug
5
comment unionSpatialPolygons Hardware recommendations
Wouldn't it be a lot easier to just download the state layer from TIGER/Census instead of trying to aggregate tens of thousands of zipcodes?
Jul
21
answered Display a NetCDF file in 3D
May
6
comment Converting datum?
Also, FYI, the differences in terms of location between the NAD27, NAD83, and WGS84 datums are fairly small (on the order of <100 m in most parts of the world)
May
6
comment Converting datum?
So: Define a projection - telling the software what projection and datum your data are in already. Projecting data: Changing the projection and/or datum to something other than the one currently defined
May
6
revised In a GeoTiff, what unit are extents in?
Didn't see last part of question
May
6
answered In a GeoTiff, what unit are extents in?
May
5
comment gdal_contour is missing lines below a certain elevation
Would it be possible for you to post a zoomed in image of the raw elevation values side by side with the contour lines in one of your problem area?
May
4
comment gdal_contour is missing lines below a certain elevation
Yea, you can subset w/ gdalwarp, or manually using a gui (qgis or arcgis). But, for the file type you're using, there shouldn't be limits on what can be stored, and if it had run out of memory, it should have thrown an error. Is it possible your data simply cannot support 10 m contours? If you run the tool on a subset of the tiff with values mostly below 500 m, do you get contour lines?
May
4
comment gdal_contour is missing lines below a certain elevation
So, these posts about the algorithm are slightly helpful: osgeo-org.1560.x6.nabble.com/…; gis.stackexchange.com/questions/50746/…
May
4
awarded  Autobiographer
May
4
awarded  Informed
May
4
answered GDAL (or other open-source) equivalent of Arc's Point To Raster Tool
May
4
comment gdal_contour is missing lines below a certain elevation
Is it just not visualizing some of the lines when you plot it or is the data actually missing? Also, you would probably get drastically increased performance and processing speed if you subset your GeoTif prior to processing and merged everything back together at the end.
May
4
comment project hdf file with geospatial_lat and lon in batch process
What kind of hdf files are these (hdf5, hdf-eos, etc.), and what program/language are you looking to use for batch processing? Also, if you're working with NASA data, why didn't you just have them reproject it for you when you ordered it?