185 reputation
17
bio website
location Melbourne, Australia
age 31
visits member for 3 years, 5 months
seen Apr 5 at 12:19

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.


Jan
8
awarded  Notable Question
Aug
3
awarded  Popular Question
Jun
28
accepted count features in polygon shapefile A that fall within each feature of polygon shapefile B
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?
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?
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?
Jun
26
asked count features in polygon shapefile A that fall within each feature of polygon shapefile B
Sep
14
awarded  Scholar
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!
Sep
14
accepted How to apply Mapnik style for OSM data in ArcMAP?
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.
May
27
revised How can you make RasterToASCII_conversion observe environment setting output cell size?
Added CheckoutExtension to enable Spatial Analyst tools
May
26
awarded  Supporter
May
25
revised How can you make RasterToASCII_conversion observe environment setting output cell size?
typo corrected
May
25
revised How can you make RasterToASCII_conversion observe environment setting output cell size?
added ArcGIS version details
May
25
asked How can you make RasterToASCII_conversion observe environment setting output cell size?
May
18
awarded  Student
May
18
asked How to apply Mapnik style for OSM data in ArcMAP?
Nov
19
awarded  Autobiographer
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