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Results tagged with raster
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user 56904
Raster is a data format consisting of regular grids of values, usually stored in an image-like format.
7
votes
Accepted
What is a raster attribute table?
But anyway a RAT ( which used to be called a VAT- value attribute table in previous ArcView/ArcInfo versions), gives you the vectorized form of the raster data. … All you have to do is multiply the count of each value by cellsize^2 to get an area for any of your raster values. …
- 2,196
4
votes
Accepted
How does ArcMap calculate the default cell size when rectifying a raster?
I remember needing this for a paper,
“The default cell size is the shortest of the width or height of the extent of the input feature dataset, in the output spatial reference, divided by 250” (ESRI, …
- 2,196
3
votes
Raster Calculator to extract elevation and slope conditions in ArcGIS for Desktop?
Con(((ASTER_Nepal.tif > 2000) & (ASTER_Nepal.tif <7000)) & ((ASTER_Slope.tif >5) & (ASTER_Slope.tif<60)),1,0)
It is however, advisable to change your tif files into ESRI grid before doing raster calculations … Also the above gives you a raster with value 1 for the conditions you set above and 0 if it doesn't meet the criteria. You can choose what values to give the true and false statement. …
- 2,196
3
votes
Accepted
Getting different pixel depths from output raster when done in ArcMap versus Arcpy?
Once you did your analysis you can Copy your output with arcpy.CopyRaster_management. Where you can specify bit depth through the pixel_type arg. For example - arcpy.CopyRaster_management("inrast","ou …
- 2,196
1
vote
How to doing spatial join for several rasters
Now Join your combined raster and your new LU_MLWSUID raster using the 'VALUE' field of your LU_MLWSUID raster and the 'MLWS_UID' column of your combined dataset. … Because the added UID on the MLWS values makes each cell unique you will have the values disaggregated in the same groups as your combined raster. …
- 2,196
1
vote
Error 999999 when converting a point feature class to a raster in python
I am not sure if you need it for the ASCII3DToFeatureClass_3d function but you might for the feature to raster conversion. Did you check out the 3D analysis extensions early on in your script? … license.
arcpy.CheckOutExtension("3D")
/* your code here
/* Check the license in when you finish
arcpy.CheckInExtension("3D")
Another issue is you have a field name 'Shape.Z' specified in your point to raster …
- 2,196
1
vote
Count the number of raster tiles in each polygon in ArcGIS
Convert your raster into a binary value of 0 for no data and 1 for data
Con(IsNull(Raster1),0,1)
Use either Zonal Statistics (spatial Analyst) or Zonal Statistics as Table (spatial Analyst) functions … However, for smaller polygons you will still have 1 for each of the polygons, even if the same raster cell covers multiple small polygons. …
- 2,196
1
vote
Transform raster donuts to circles
For an ArcGIS, you can use Block statistics using statistics type Majority. May be a bit of trial and error with the neighborhood statistics is needed. For example you can try circle or irregular opti …
- 2,196
1
vote
Accepted
Conditional Combine Rasters and Track which Raster pixel used
Use cell statistics tool in ArcGIS, to make a raster of
maximum values from input raster1, raster2 and raster3.<- let step1
output = MaxValue
Step 2. … Use Combine raster tool to compine rasters MaxValue and
MaxRaster. …
- 2,196
1
vote
Accepted
Clipping raster with polygon for band-by-band output using ArcGIS Desktop?
First clip the raster with your polygon and save the clipped multi-band image.
Then use the 'lookup' took in ArcGIS to separately save the different bands from your clipped multi-band image. …
- 2,196
0
votes
"Extract by Mask" changing raster pixel values...or not?
You do not need to remove the black background to mosaic images. Are you using ENVI or ERDAS or ArcGIS to mosaic the images? you can simply find out the value of the black area, check if the no data v …
- 2,196
0
votes
Accepted
Raster copy multiple rasters keeping name but dropping extension
AFAIK just removing an extension doesn't make a file a GRID format, what you need is the function Raster To Other Format (multiple)
.
You can use it in model builder. …
- 2,196