topic Re: Why these two rasters can�??t be summed up? in ArcGIS Spatial Analyst Questions

Why these two rasters can???t be summed up?

JamalNUMAN — Wed, 06 Jun 2012 17:53:06 GMT

Why these two rasters can???t be summed up?

I???m wondering why the two raster shown in the screenshot below cannot be summed up?

What might be the reason?

[ATTACH=CONFIG]14987[/ATTACH]

Thank you for the help,

Best

Jamal

Re: Why these two rasters can�??t be summed up?

DanPatterson_Retired — Wed, 06 Jun 2012 18:17:37 GMT

invalid link error

Re: Why these two rasters can�??t be summed up?

EricRice — Wed, 06 Jun 2012 18:49:13 GMT

Jamal,

What is happening when you click OK on the tool? Adding two rasters together is basic functionality and is working correctly from my tests. I just added a floating point raster to an integer raster just like you're attempting to do. Your syntax is correct, so you need to elaborate on what's going on.

Eric

Re: Why these two rasters can�??t be summed up?

JamalNUMAN — Wed, 06 Jun 2012 18:50:05 GMT

invalid link error

Thanks Dan. but why it is invalid?

Re: Why these two rasters can�??t be summed up?

DanPatterson_Retired — Wed, 06 Jun 2012 19:30:48 GMT

Jamal when I click on the link in your initial thread, that is error message I got. Usually you have images in your threads but not this time.

Re: Why these two rasters can�??t be summed up?

EricRice — Wed, 06 Jun 2012 19:42:09 GMT

Dan,

The link is working for me for some reason...That is how I knew his syntax was correct.

Eric

Re: Why these two rasters can�??t be summed up?

JamalNUMAN — Wed, 06 Jun 2012 20:22:12 GMT

Jamal when I click on the link in your initial thread, that is error message I got. Usually you have images in your threads but not this time.

Sorry about that.

I�??m attaching the screenshot to this post. Many thanks for the help.

[ATTACH=CONFIG]14996[/ATTACH]

I couldn't attach both rasters as the size of one of them is more than 2MB. however, the link below might work:

http://www.mediafire.com/?pk6tp1n5zomd3ho

Best

Jamal

Re: Why these two rasters can�??t be summed up?

JamalNUMAN — Wed, 06 Jun 2012 20:24:39 GMT

Dan,

The link is working for me for some reason...That is how I knew his syntax was correct.

Eric

then could you guess why it is not working Eric? I've attached the two raster in my previous post.

thanks

jamal

Re: Why these two rasters can�??t be summed up?

EricRice — Wed, 06 Jun 2012 20:32:02 GMT

First, you have to tell me what you mean by "not working". Is there an error? Is the output wrong? Have you tried running the Plus tool instead?

Eric

Re: Why these two rasters can�??t be summed up?

JamalNUMAN — Wed, 06 Jun 2012 20:42:58 GMT

First, you have to tell me what you mean by "not working". Is there an error? Is the output wrong? Have you tried running the Plus tool instead?

Eric

Many thanks Eric for the prompt answers.

please, have a look on the sort of errors i got on the screenshots below

[ATTACH=CONFIG]15001[/ATTACH], [ATTACH=CONFIG]15002[/ATTACH]

best

Jamal

Re: Why these two rasters can�??t be summed up?

DanPatterson_Retired — Wed, 06 Jun 2012 21:03:16 GMT

try sending your output to a folder rather than a geodatabase
also ensure that both files have the same projection

Re: Why these two rasters can�??t be summed up?

EricRice — Wed, 06 Jun 2012 21:15:25 GMT

Writing to the default geodatabase should be fine, but you could try GRID if you want. The rasters do not have to have the same projection either, although recommended. What is more revealing to me is the geodatabase you provided. There is only the A raster which isn't one your trying to add, but nonetheless I noticed that it doesn't have a spatial referenced defined. Also, I went back to your screenshots and noticed that even though Elevation is the 3rd layer in the map, it is always the raster being shown behind the other dialogs that are open. This begs the question...Does B even line up with Elevation? Or is too much of the display being hid by the other dialogs in your screenshots to see that B is a subset of Elevation?

Eric

Re: Why these two rasters can�??t be summed up?

EricRice — Wed, 06 Jun 2012 21:36:41 GMT

Jamal,

One more thing. I looked up the nested error, "Error 010422" and found it is related to the Mask setting in the environment settings. So even if B does line up with Elevation, if you have a mask set in the environments for some other location that doesn't overlap either B or Elevation, the tool would fail with this error.

http://resourcesbeta.arcgis.com/en/help/main/10.1/index.html#//00vq0000000s010422

Eric

Re: Why these two rasters can�??t be summed up?

JamalNUMAN — Thu, 07 Jun 2012 20:47:31 GMT

try sending your output to a folder rather than a geodatabase
also ensure that both files have the same projection

Many thanks.

Quite frustrating.

I set the output to be in a folder,
[ATTACH=CONFIG]15046[/ATTACH]

I make the two raster on the same coordinate system
[ATTACH=CONFIG]15049[/ATTACH]

But still the error is there!!!!

[ATTACH=CONFIG]15047[/ATTACH]

What might be further there?

it remains to say that the B raster is derived from the "create random raster", does this matter?

[ATTACH=CONFIG]15048[/ATTACH]

Re: Why these two rasters can�??t be summed up?

EricRice — Thu, 07 Jun 2012 21:02:07 GMT

Jamal,

Please send a screenshot of 'B' layer properties so I can see the extent values. Please do the same for Elevation. What happens if you add Elevation to a blank map, then add B to it? Does B overlay Elevation? If layer B has the same extent values as layer A that you uploaded to this forum, that would explain the issue. You can't add two rasters together if they don't line up with one another.

Eric

Re: Why these two rasters can�??t be summed up?

JamalNUMAN — Thu, 07 Jun 2012 21:24:57 GMT

Jamal,

Please send a screenshot of 'B' layer properties so I can see the extent values. Please do the same for Elevation. What happens if you add Elevation to a blank map, then add B to it? Does B overlay Elevation? If layer B has the same extent values as layer A that you uploaded to this forum, that would explain the issue. You can't add two rasters together if they don't line up with one another.

Eric

Thanks a million! My issue is solved.

The problem that the created random layer is not lined up with the elevation raster (as you have advised)! I have to set the extent of the �??random raster�?� to be the same as the elevation raster!

Now it is working!

Appreciated

Jamal

[ATTACH=CONFIG]15050[/ATTACH]