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seen Jul 29 '13 at 14:51

GIS Newbie


Sep
24
awarded  Autobiographer
Apr
4
awarded  Popular Question
Aug
22
awarded  Commentator
Aug
22
comment Is it possible to convert a Geoserver SLD to Quantum QML format?
Thanks for your response. I tried opening it from 1.6, it opened fine. But the whole symbology has changed.
Aug
22
asked Is it possible to convert a Geoserver SLD to Quantum QML format?
Jul
28
accepted Does a Zonal Statistics value change when applied on a subset of data?
Jul
28
comment Does a Zonal Statistics value change when applied on a subset of data?
Thank you so much :)
Jul
28
comment Does a Zonal Statistics value change when applied on a subset of data?
Further, after reading your reply, I changed projections just to check and it returns different values for different projections. For UTM, it returned 624, for LCC it returned 456. Now, I am even more confused :). When the projection of both zones and value raster is same, should it not return the same maximum each time?. And in above case, why would it not return 624. I hope I am not doing anything wrong.
Jul
28
comment Does a Zonal Statistics value change when applied on a subset of data?
I processed 20000 polygons of the whole country initially and then picked up 5 random polygons to check if the results are same. The unique pixel values falling in polygon A are, say, 314,624,456,234. Zonal stats returned 314 as max for polygon A, which is the majority but not max. This was the case when I processed it along with 20000 other polygons. Interestingly, when the same polygon was processed with just 5 other polygons, it returned 410. Both of them are incorrect.
Jul
28
comment Does a Zonal Statistics value change when applied on a subset of data?
Thank you so much for your patient reply. I am still baffled about how the result might change for the same raster when processed with a smaller number of polygons.I used a cell size of 0.001 for raster generation.What confuses me is, if the same polygon is being rasterized internally and same number of pixels are contained in it, why does zonal stats show a value different than previous ones.
Jul
26
asked Does a Zonal Statistics value change when applied on a subset of data?
Jul
9
comment Select a distinct attribute with maximum shape area
I am using Eliminate in Arcinfo 9.3. Even after using it, there are some sliver polygons leftover. The best chance i have to accurately remove them is to select the one with maximum area in repeating 'code' values. I have Postgresql 8.4 as well.
Jul
8
asked Select a distinct attribute with maximum shape area
Jul
3
awarded  Student
Jul
3
comment How to assign values to a polygon layer based on nearest point in a point layer?
Also, please note that the match option "closest" is not available in Spatial Join in ArcMap 9.2
Jul
3
asked How to assign values to a polygon layer based on nearest point in a point layer?
Jul
2
answered Sandbars feature extraction from satellite image
Jul
2
awarded  Scholar
Jul
2
comment How to implement a spatial query on polygon data for a specific point?
Thanks a lot! Your answer pointed me in the right direction.
Jul
2
accepted How to implement a spatial query on polygon data for a specific point?