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| bio | website | staff.acecrc.org.au/~mdsumner |
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| location | ||
| age | ||
| visits | member for | 2 years, 6 months |
| seen | May 9 at 21:49 | |
| stats | profile views | 78 |
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Apr 22 |
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R Raster package: write NetCDF with time dimension Can you add some data, or at least include str(gridfile) and sessionInfo() so we know your R, raster, and ncdf/ncdf4 versions? |
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Feb 18 |
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gdal_contour creates an empty shapefile can you give us the output of gdalinfo hazard_interp4.asc -stats ? |
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Feb 12 |
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How to record tracks finer than 10-30cm resolution (possibly using an iPhone)? Bread crumbs or cotton? |
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Feb 6 |
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Difference between gdal versions in reading raster on two machines? try using readGDAL() directly in rgdal package to isolate whether it's a raster package issue or not |
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Jan 17 |
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Spatial indexing of a point pattern in R answered here, please declare cross-postings if you must do it, it's a fairly basic courtesy stat.ethz.ch/pipermail/r-sig-geo/2013-January/017222.html |
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Jan 4 |
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Converting geographic coordinate system in R rgdal does recognize EPSG:2056, FWIW |
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Jan 1 |
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Giant 2.5 GB JP2 image: How to tile it? try gdal2tiles.py |
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Dec 12 |
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Tiling Rasters based on an existing Polygon Shapefile (Vector Grid) You would have to add the looping part but see the cutline and cwhere arguments to gdalwarp, I think together you could crop out tiles based on each tile in the vector source. |
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Dec 12 |
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How to create cohesive Spatial Pixels from Spatial Points Dataset I think I see what you mean, to interpolate a new grid from irregular data you need a base grid first that covers the region at a sensible resolution. You can do this pretty easily by hand using the tools, but take a look at trip::makeGridTopology for a stab at generalizing it while keeping all the options open. You still need to generate the Data part but it's not hard. If this sounds right I will answer with an example and wrapper function (that might be more generally useful). |
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Dec 8 |
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Converting a .jpg map into a shapefile jpg is probably the worst format for digitizing like this though, JPEG compression is lossy and no good for clean straight lines and so on. You cannot reconstruct good data from a JPEG once it's been in that format. |
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Dec 6 |
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How to georeference an areal photograph given known coordinates of the four corners and center of the image use gdal_translate with argument a_ullr for "assign upper left, lower right. |
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Dec 5 |
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Exporting Grid from R to use it in ArcGIS FWIW raster, sp, and rgdal all provide independent support to create ESRI Ascii files, but it's a very poor choice given the lack of projection metadata, tiling, or compression and inconsistent support for non-square cells |
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Dec 5 |
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Exporting Grid from R to use it in ArcGIS You need to specify what the target software can read, or at least what version of it you are using so someone can find out. Recent versions of ArcGIS use GDAL so rgdal is the best place to start. GeoTIFF is generally the best choice unless you have special needs |
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Dec 3 |
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How to create a 4096x4096 png from a 1440x720 data set using GDAL? use VRT to embed your image within the larger virtual one |
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Nov 27 |
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Which GIS (with GUI) produces good-looking maps for a reasonable price? poor diddums so sad |
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Nov 17 |
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How to stop gdalwarp creating world-spanning outputs near the dateline? maybe use -te argument for "target extents", or fix up the extents first using gdal_translate with a_ullr to overwrite the existing, or -projwin to cut out the bit you want within the bounds |
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Oct 9 |
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Looking for a user-friendliness & functionality comparison for ArcGIS and QGIS It would still be troublesome for someone. |
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Oct 9 |
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Looking for a user-friendliness & functionality comparison for ArcGIS and QGIS yes fair enough, but you can see what's being compared in the original doc (added with edit) |
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Aug 14 |
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Why does gdalbuildvrt not allow these things? As with any warping, it's about generating a new grid of (possibly "rotated") points across the inputs and resampling with them via a given method (nearest neighbour, bilinear interpolation). Plenty of tools can do it to various levels of control, including gdalwarp, which will actually build VRT for you with -of VRT. |
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Apr 11 |
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Cannot replicate gdaltransform example You should drop FWTools and get a newer build, yours is way out of date. There are installers for Windows here, so it's not the same as FWTools but easy enough: gisinternals.com/sdk |
