[GRASS-user] Snap distance to clean imported map?

2019-09-11 Thread Rich Shepard
Importing a large (4.4G) vector map of wetlands takes a long time even on my 8-core/16-thread, 32G desktop. When it finally completed grass recommended re-importing with an additional 'snap' distance specified: Command line: > v.in.ogr in=OR_geodatabase_wetlands.gdb out=more_wetlands

Re: [GRASS-user] Organizing data over extensive areas [RESOLVED]

2019-09-11 Thread Rich Shepard
On Wed, 11 Sep 2019, Rich Shepard wrote: Is there a way to put a collection of locations in a single subdirectory, e.g., /data/grassdata/fishes/ and have grass know how to find them? Never mind, I figured it out. I wrote a script to reproject the map from each individual location's PERMANENT

[GRASS-user] Organizing data over extensive areas

2019-09-11 Thread Rich Shepard
I imported an OpenFileGDB containing the distributions of 14 species and runs of fish in the Columbia River Basin. Because one species has a different CRS than the others each layer needed to be separately imported into separate locations. This is inefficient and I would like to gather them in a

[GRASS-user] Explain v.in.ogr error

2019-09-11 Thread Rich Shepard
Trying to import an ESRI FileGDB with 10m DEM for Oregon. I don't understand what I've done incorrectly and would appreciate learning from the grass command error message. Input file is OR_DEM_10M.gdb $ ogrinfo -al -so Geometry: Multi Polygon Feature Count: 1 Extent: (-106508955.00,

Re: [GRASS-user] tiling and 'cliping' DEMs

2019-09-11 Thread Rich Shepard
On Wed, 11 Sep 2019, Nikos Alexandris wrote: If there is no need for a GDAL VRT, then, alternatively, link all tiles as pseudo-raster maps in GRASS GIS' data base, of course using `r.external`. Then, build a GRASS GIS virtual raster data set using `r.buildvrt`. Clipping or "extracting" parts of

Re: [GRASS-user] tiling and 'cliping' DEMs

2019-09-11 Thread Rich Shepard
On Tue, 10 Sep 2019, Helmut Kudrnovsky wrote: To save diskspace,, build a virtual raster with your tiles outside GRASS by GDAL's buildvrt, do r.external yourvirtual.vrt. No import is needed for raster calculations, r.external to link the virtual raster works nicely.. regarding to clip a

Re: [GRASS-user] tiling and 'cliping' DEMs

2019-09-11 Thread Nikos Alexandris
* Helmut Kudrnovsky [2019-09-10 20:12:09 -0700]: Rich Shepard wrote I am downloading and importing 1m LiDAR DEMs for a 667 mi^2 (1727.5 km^2) drainage basin. These are all in 7.5' topographic quad sections. The files take up a lot of disk space and memory when working with them. I assume