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No data in interpolated raster.

FalakZahoor

I am performing IDW interpolation. It gives a raster successfully with the correct values showing up in the contents table. However, the raster is not showing in the map area. On checking I found that the raster contains no data (when I tick the 'color the nodata' option in symbology , the whole interpolated area shows colored, indicating that the raster has no data. I don't understand what the problem could be.

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FalakZahoor

Solved. There was an issue with the Mask being used in the Raster Analyis in Environments. I realised if the mask is a point or a line shapefile, the output interpolation raster is empty. The mask has to be a polygon shapefile, only then it will work.

FalakZahoor

Yes the data is in decimals.

Here are a point from the file

SiteNo. Code Lat Long 1 2 3 4 5 6
1 S-ARBG 34.0231 74.8129 148.00 141.00 140.00 142.00 142.00 143.00
I have 121 such lines in the file covering an extent between lat 33.8964 to 34.2373 and long 74.639 to 75.019

Yes. The deafult number was 12. I changed it to 121= number of points in the file.

danretired

I suspect your data then.

Are the coordinates in decimal degrees?

What extent do they cover?

What are the Z values? Is there a range? or is it defined within the SHAPE field or as a separate field?

With "variable" the default number of points should be 12 not 121

FalakZahoor

I tried using text file as well as a sheet (excel) with 121 points. I even converted the sheet to shapefile and then tried to interpolate. Even then the raster output was empty.

Steps: Spatial Analtst Tools> Interpolation> IDW> dialogue box

In the dialogue, the settings are

Input point feature (text or excel sheet or shapefile)

Output cell size: 1.36359999e-03 (default)

Power: 2 (default)

Search radius: variable extent

Number of points 121

danretired

What were the inputs? A point featureclass? a shapefile? How many points?

What were the properties selected in the dialog?

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