network profile
| bio | website | |
|---|---|---|
| location | Melbourne, Australia | |
| age | 31 | |
| visits | member for | 2 years, 7 months |
| seen | Apr 7 at 12:47 | |
| stats | profile views | 26 |
I'm a PhD candidate at the University of Melbourne, and am involved in integration of species distribution models and spatially explicit models of population dynamics to predict species' extinction risks under climate change.
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Aug 3 |
awarded | Popular Question |
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Jun 28 |
accepted | count features in polygon shapefile A that fall within each feature of polygon shapefile B |
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Jun 28 |
comment |
count features in polygon shapefile A that fall within each feature of polygon shapefile B The above still seems quite slow (although maybe my expectations are too high...). Can anyone see a way to speed this up? |
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Jun 28 |
comment |
count features in polygon shapefile A that fall within each feature of polygon shapefile B I tried out spatialite and it seems like a viable option. I was interested in identifying the features of A (or their count) that occurred within (incl. crossing, etc.) each of the features of B, I ended up using: SELECT polyA.pk_uid AS pk_A, polyB.pk_uid AS pk_B
FROM polyA, polyB
WHERE ST_Intersects(polyB.Geometry, polyA.Geometry)
AND polyB.ROWID IN
(
SELECT pkid FROM idx_polyB_Geometry
WHERE pkid MATCH RTreeIntersects
(
MBRminX(polyA.geometry),
MBRminY(polyA.geometry),
MBRmaxX(polyA.geometry),
MBRmaxY(polyA.geometry)
)); Comments? |
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Jun 26 |
comment |
count features in polygon shapefile A that fall within each feature of polygon shapefile B Thanks webrian, but I can't quite figure out how to use it for my purposes... I get the feeling it just returns those features in ainput that overlap with features of binput (overlap is the default, and apparently the only option available without GEOS, which I haven't yet worked out how to use with GRASS via R). I will try directly from GRASS though, to see whether there might be more to it than I realise. Can you provide an additional info re how to invoke v.select? |
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Jun 26 |
asked | count features in polygon shapefile A that fall within each feature of polygon shapefile B |
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Sep 14 |
awarded | Scholar |
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Sep 14 |
comment |
How to apply Mapnik style for OSM data in ArcMAP? Thanks Ray. I haven't fired up Windows for a while, but will give this a shot next time I'm working with ArcMap. I appreciate the answer, it sounds promising! |
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Sep 14 |
accepted | How to apply Mapnik style for OSM data in ArcMAP? |
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Jun 7 |
comment |
How can you make RasterToASCII_conversion observe environment setting output cell size? So, there's no way to set the cell size environment variable with Python, and get RasterToASCII_conversion to pay attention to it? I had thought that setting the arcpy.env. variables would do the trick. Is there another group of env variables that needs to be set? Ideally, I'd like to process these rasters with Python, and avoid Spatial Analyst. |
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May 27 |
revised |
How can you make RasterToASCII_conversion observe environment setting output cell size? Added CheckoutExtension to enable Spatial Analyst tools |
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May 26 |
awarded | Supporter |
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May 25 |
revised |
How can you make RasterToASCII_conversion observe environment setting output cell size? typo corrected |
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May 25 |
revised |
How can you make RasterToASCII_conversion observe environment setting output cell size? added ArcGIS version details |
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May 25 |
asked | How can you make RasterToASCII_conversion observe environment setting output cell size? |
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May 18 |
awarded | Student |
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May 18 |
asked | How to apply Mapnik style for OSM data in ArcMAP? |
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Nov 19 |
awarded | Autobiographer |
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Nov 18 |
comment |
How can I compute raster pixel width and height given raster bounds, row count, and column count? That said, take a look at Wikipedia's Great-circle Distance page. en.m.wikipedia.org/wiki/Great-circle_distance |
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Nov 18 |
comment |
How can I compute raster pixel width and height given raster bounds, row count, and column count? I'm sure you're aware that the length of a degree of longitude varies with latitude (from infinitesimally small at the poles to roughly 111 km at the equator). I would have thought that to calculate cell dimensions in meters by hand would be more of a hassle than with e.g. Global Mapper. |
