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Results tagged with zonal-statistics
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user 34531
Zonal statistics summarize the values of one raster within the zones of another dataset (either raster or vector) and output the results as a raster (for a single statistic) or table (for multiple statistics).
1
vote
Different area values from Zonal Geometry and Tabulate area
Yes, your results look weird because both approaches are using rasters. One would expect similar decimal accuracy.
I did an experiment: converting integer raster to polygon with all environment sett …
- 23.3k
2
votes
Arcpy - process large shapefile in groups of 100 via cursor
I'd create a new short field in original shapefile, e.g. GROUP and populate it using:
!FID!//100
and create temporary subset using:
for i in range(30):
query='"GROUP" = %s' %i
arcpy.Select …
- 23.3k
0
votes
Converting data in table created by Zonal Statistics as Table tool back into raster file?
Use lookup in reclassify toolbox to convert your zones raster to floating point raster. Export it ASCII afterwards
- 23.3k
0
votes
Correcting Errors in Height Above Nearest Drainage (HAND) model
Solution you refer to might work on very dense stream network. Obviously it is not your case.
I assume that what you call HAND is height above elevation of nearest drainage points downstream, i.e. fi …
- 23.3k
3
votes
Accepted
Zonal statistics 2 ends up causing a fatal error. Is there an alternative?
To solve this you'll need to split your polygons into groups without overlap. It is called graph coloring.
To make script below work a)install networkx package and b)run:
PolygonNeighbors("POLYGONS", …
- 23.3k
2
votes
Zonal statistics for millions of overlapping polygons in ArcPy?
Convert raster to points
Intersect points with polygons, output type POINT
Statistics on raster value, using polygon id as case field.
You might consider to split the area, if raster too big
- 23.3k
1
vote
Accepted
Using Zonal Statistics As Table for overlapping polygons in ArcPy?
You CAN do it using vectors, 100% agree with others. Anyway, I slightly modified your code, replacing very long names and it works as expected:
import arcpy
store_buffs = r"D:\Scratch\A30min_weekday. …
- 23.3k
5
votes
Accepted
Too many zones for Zonal Histogram?
If your tif files store integer values you might try tabulate area tool (zones-polygon ids), thus transposing the table.
It'll have 4000 rows instead of 4000 columns. If value grids store floating po …
- 23.3k
1
vote
Zonal statistics for millions of overlapping polygons in ArcPy?
Pre-processing:
Create fishnet - polygons with extent=extent of overlapping polygons. Calculate
field ID = FID.
Spatial join overlapping polygons with fishnet polygons using
HAVE_THEIR_CENTER_IN.
Di …
- 23.3k
9
votes
Major bug in ArcGIS Zonal statistics?
It is a bug.
Something terribly wrong with cell count.
Correct mean (9.0452380952381) times correct number of non-empty cells (420) divided by 297 (that is a cell count reported by tool) results in 1 …
- 23.3k