raster calculator expression box missing - ArcGIS 10

[AliMuhyidin]

Dear All,

I have used ArcGIS 10 for couple days. I have a problem with raster calculator. There is no expression box.
From help button, I know that the box suppose to be in between output raster and map expression.
Although I am able to do calculation but I could not see and review what kind formula I wrote.
Is there any way to show the expression box?

Thanks.

Best,

Masalie

[YoshiTsuzuki]

The original post is rather old, but I have encountered to the similar problem. Any solution will help. The expression window in the raster calculator is missing. Thanks for your reply.

[XanderBakker]

Hi Yoshi,

The Raster Calculator is still there, but has moved from the Spatial Analyst toolbar to the Toolbox:
Spatial Analyst Tools\Map Algebra\Raster Calculator

[ATTACH=CONFIG]27864[/ATTACH]

Kind regards,

Xander

[YoshiTsuzuki]

Hello Xander

Thank you for your reply. Yes, I open Raster calculator from the ArcToolBox: Spatial Analysis Tools - Map Algebra - Raster calculator.
I have uninstalled ArcGIS and installed it again, however, the situations are the same. I would be glad with any further solution or suggestion. (I may try arcHydro in a few days to go around this problem though.)

Thanks,
Yoshi

[XanderBakker]

Hi Yoshi,

I should have read your question more carefully. In this case I think it is best to contact Esri support and provide all the information about the system you're installing on, the version you're using. Just checked it on my systems and in 10.2 and 10.1 (SP1) I have a working expression window.

The alternative at this moment is to use the Python window in ArcGIS:
What is the Python window?

Example:

import arcpy
from arcpy.sa import *

# myRas = arcpy.Raster('the name of the raster in the TOC or path to raster')
myRas = arcpy.Raster('J000_CumCO2_kgha')

# now you are able to perform any type of raster calculator analysis; like for instance:
myResult = Con(IsNull(myRas),FocalStatistics(myRas,NbrRectangle(5,5,"CELL"),"MEAN","DATA"),myRas)

Some more reading:
Executing tools in the Python window

Kind regards,

Xander

[YoshiTsuzuki]

Hello Xander

Thank you for your advice. I will try these methods. I will report again if there will be further problems.

Thanks
Yoshi

[YoshiTsuzuki]

Hello Xander

Using Phyton may be a good idea to go around this problem, but the problem is I am a newone for Phyton. What I want to do is as the followings:
1) use raster calcultor to evaluate "raster01 > 5000",
2) in the resulting calculation layer (calc01), resympolize the "0" values to be "No Color" or transparent.

I checked ArcGIS Desktop Help page and tried to use Phyton but might have some mistakes. Any help or suggestion will be welcomed.

>>> import arcpy
>>> from arcpy.sa import *
>>> myRas = arcpy.Raster('raster01')
>>> from arcpy import env
>>> env.workspace="C:\GISdata\workspace"
>>> inRaster="raster01"
>>> "raster01>5000"
'raster01>5000'
>>> arcpy.CheckOutExtension("Spatial")
u'CheckedOut'
>>> Calcuation.save("C:\GISdata\workspace")
Runtime error
Traceback (most recent call last):
  File "<string>", line 1, in <module>
NameError: name 'Calcuation' is not defined

[XanderBakker]

Hello Xander

Using Phyton may be a good idea to go around this problem, but the problem is I am a newone for Phyton. What I want to do is as the followings:
1) use raster calcultor to evaluate "raster01 > 5000",
2) in the resulting calculation layer (calc01), resympolize the "0" values to be "No Color" or transparent.

I checked ArcGIS Desktop Help page and tried to use Phyton but might have some mistakes. Any help or suggestion will be welcomed.

>>> import arcpy
>>> from arcpy.sa import *
>>> myRas = arcpy.Raster('raster01')
>>> from arcpy import env
>>> env.workspace="C:\GISdata\workspace"
>>> inRaster="raster01"
>>> "raster01>5000"
'raster01>5000'
>>> arcpy.CheckOutExtension("Spatial")
u'CheckedOut'
>>> Calcuation.save("C:\GISdata\workspace")
Runtime error
Traceback (most recent call last):
  File "<string>", line 1, in <module>
NameError: name 'Calcuation' is not defined

Hi Yoshi,

You're almost there. A few things should be changed.

import arcpy
from arcpy import env
env.workspace = r'C:\GISdata\workspace'
# arcpy.CheckOutExtension("Spatial")
myRas = arcpy.Raster('raster01')
myResult = myRas > 5000
myResult.save('myOutputName')

A few comments on the differences:

• When setting your workspace, use forward slashes, double backslashes or just put an 'r' before the path to avoid errors: env.workspace = r'C:\GISdata\workspace'


• Switching on the Spatial Analyst extension and setting the workspace (Geoprocessing/Environments) can also be done through the menu. The Python window will inherit these settings.


• I assume your TOC holds your input raster "raster01"


• When performing a calculation you need to specify an output (like "myResult"): myResult = myRas > 5000. At this point the SA license should be available.


• When saving the raster you specify the name you want to assign to the raster (example "myOutputName")


• The raster will be stored in the current workspace (in this case "C:\GISdata\workspace")


• The result is a raster with 0 (raster01 <= 5000) and 1 (raster01 > 5000) and NoData cells where the input has Nodata cells.

Kind regards,

Xander

[YoshiTsuzuki]

Hello Xander

Thank you very much for your advices. I could go around the Raster calculator window problem. Your explanation of Phyton will be benefitial for someone who encountered similar problem in the future.

Thanks
Yoshi

[XanderBakker]

Hi Yoshi,

I'm glad I could be of any assistance. If you think it was helpful you  can use the "arrow" button in order to help other  members find useful information:

[ATTACH=CONFIG]27933[/ATTACH]

More info here: http://resources.arcgis.com/en/help/forums-mvp/

Kind regards,

Xander