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what is the "Dissolve" tool for rasters?

JamalNUMAN

what is the "Dissolve" tool for rasters?

please, see the attached image that shows my question

I'm trying to dissolve the cell of the raster based on the Iprime field, but couldn't fine an equivalent tool.

I tried to use the "reclassify" tool but resulted raster was meaningless!

thank you

regards

Jamal

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Blog2_LeakSurvey_CatalogView.png

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SaseenNajjar

I'm not 100% positive, but it seems that the Lookup (Spatial Analyst) in ArcGIS Pro 10 acts like a dissolve tool for rasters.

KylePurdon

A combination that in-depth is a bit out of my realm. It seems if would best be accomplished with some sort of script or combination of conditional statements. You may even take this to the geoprocessing or other sections of the forums.

Maybe someone with a bit more experience can help out!

Best of luck!

DanielBettinger_1-1747944672362.png

JamalNUMAN

I think I found the loophole. The IPRIME Field in your raster is a "Double" value. The tools seem to only like Floating Point or Integer values. If you can live with your values *10 you can just make an integer field and use the field calculator. Then use the lookup tool (It works, I tried it). If you create a floating point field or keep the double and use the lookup there is an Arc10 glitch that makes 0.4 0.40000012 (or adds some random decimal to the end).

Where is this data coming from? Do you have an original file/files you used to create this raster? With that I could provide some more help.

So to review the loophole is:
Create a new field of type integer
Calculate value to be IPRIME * 10
Use the lookup tool to create a new raster based on your new integer field
There ya go.... a nice roundabout method

Thank you Kyle for the help. finally it did work!

now i got a dissolved raster with the values of 0.2, 0.4, 0.6, 0.8 and 1
i have another raster of the values: a, b, c and d

what i need now in to combine them then to add a field in which I'm going to apply the If statement below:

----------------------------------------------------------------------------
if [CtachType] = "a" then
Select Case [Iprime]
Case .2
OP= 0
Case .4
OP= 0
Case .6
OP= 0
Case .8
OP= 0
Case 1
OP= 0
end select

else

if [CtachType] = "b" then
Select Case [Iprime]
Case .2
OP= .2
Case .4
OP= .4
Case .6
OP= .6
Case .8
OP= .8
Case 1
OP= 1
end select

else

if [CtachType] = "c" then
Select Case [Iprime]
Case .2
OP= .4
Case .4
OP= .6
Case .6
OP= .8
Case .8
OP= 1
Case 1
OP= 1
end select

else

if [CtachType] = "d" then
Select Case [Iprime]
Case .2
OP= .6
Case .4
OP= .8
Case .6
OP= 1
Case .8
OP= 1
Case 1
OP= 1
end select

end if
end if
end if
end if
-----------------------------------------------------------------------------------------
unfortunately, the combine tool switches the original values to another ones!!!!! so that i can't apply the above If statement!!!!

very confusing and exhausting!!!!!!!!

how can i combine these two rasters but to keep the original values to proceed in the analysis???

please, see the attached images. The second image shows the flow chart that i apply in order to derive what we call I-map.

in order to derive the I-map, 4 main rasters are involved:

Land use: forest, field/meadow/pasture
Slope:

.5%, 3.5%-27%, >27%
Hydraulic conductivity: Type A, Type B, Type C, Type D, Type E, Type F
Surface catchment: a, b, c, d

then these rasters are combined according the logic illustrated in the flow chart (2nd image in the attachment)

in each single step of the analysis, i got stuck!!!! ArcGIS doesn't give a smooth path to accomplish the analysis straight forward!!!!

So how can i combine the two rasters but to keep the original values????

regards

Jamal

Clip_100.jpg

Clip_98.jpg

DanielBettinger_2-1747944672364.png

7_Katastrophenschutz und DRP.pdf

Agenda 2. AWT 3D GIS Geologie (002).pdf

KylePurdon

I think I found the loophole. The IPRIME Field in your raster is a "Double" value. The tools seem to only like Floating Point or Integer values. If you can live with your values *10 you can just make an integer field and use the field calculator. Then use the lookup tool (It works, I tried it). If you create a floating point field or keep the double and use the lookup there is an Arc10 glitch that makes 0.4 0.40000012 (or adds some random decimal to the end).

Where is this data coming from? Do you have an original file/files you used to create this raster? With that I could provide some more help.

So to review the loophole is:

Create a new field of type integer
Calculate value to be IPRIME * 10
Use the lookup tool to create a new raster based on your new integer field
There ya go.... a nice roundabout method

NawajishNoman

Hi Jamal,

If I understand your question correctly (the image is very small so I can't really see it clearly), you can use the Lookup tool to create a new raster using Iprime as the lookup field.

Please let me know if it does not work for you.

Thanks,
Noman
Esri, Redlands, CA.

JamalNUMAN

Jamal, I would contact Support and open an incident with them. It looks like you are having issues with that dataset in multiple tools. Without the data in hand, it's going to be difficult to guess what the problem is.

the data is attached

thank you

Jamal

IPrime.zip

CCU 2018 - Gestión de Redes de Servicios Públicos.pdf

PatrickTaurman

Jamal, I would contact Support and open an incident with them. It looks like you are having issues with that dataset in multiple tools. Without the data in hand, it's going to be difficult to guess what the problem is.

JamalNUMAN

Use the Lookup tool. It will take a raster, and use a field, and make a new raster. To output a ESRI Grid, just don't put an extension on the end of the name (i.e. instead of test.tif just call it test).

If you are just looking to go from Tiff to Grid, just use Copy Raster.

What i'm looking for is to have a dissolved raster of values: 0.2, 0.4, 0.6, 0.8 and 1.

please, see the attached images that show that the "lookup" too is not helpful to achieve what I'm looking for

what else i may try?

Clip_89.jpg

Clip_90.jpg

BUENAS PRACTICAS DE VUELO DRONE2MAP.pdf

2014-06-30_G64583_UC2014UX-UISummit_Flier.pdf

PatrickTaurman

Use the Lookup tool. It will take a raster, and use a field, and make a new raster. To output a ESRI Grid, just don't put an extension on the end of the name (i.e. instead of test.tif just call it test).

If you are just looking to go from Tiff to Grid, just use Copy Raster.

JamalNUMAN

convert the tif to an ESRI grid using the IPRIM field

but using which tool can i convert the TIF to ESRI GIRID?

DanPatterson_Retired

convert the tif to an ESRI grid using the IPRIM field

KylePurdon

This is a long shot but maybe the Raster to Polygon tool wont work with decimals. Try multiplying the field by 10 and then converting Raster - Polygon. This would make 1 = 10 0.8 = 8 and so on.

JamalNUMAN

It depends on what you want to do with the raster. You could just create a new raster where the field you want is the "Value" field and then just use that raster as a "zone". Or you could just change the symbology so that it represents the field you want.

Another method would be to covert your raster to a polygon based on the field you want, then use the dissolve and convert back to a raster. As far as I know there is no "raster dissolve" tool.

You could also use some sort of conditional statement as well if you want to dive into that.

Thank you for the answer Kyle.

please, have a look on the attached image that shows that i cant convert the raster to polygons according the Iprime field that contain real numbers

what I'm looking for is to have a raster that has only the values: 0.2, 0.4, 0.6, 0.8 and 1. (out of the given raster)

then this raster (Iprime) is intended to be combined with another raster (CtachType) that has the values: a, b, c and d.

then a field is added to the combined raster and its values are calculated according to the following if statement:

------------------------------------------------------------------------------------------
if [CtachType] = "a" then
Select Case [Iprime]
Case .2
OP= 0
Case .4
OP= 0
Case .6
OP= 0
Case .8
OP= 0
Case 1
OP= 0
end select

else

if [CtachType] = "b" then
Select Case [Iprime]
Case .2
OP= .2
Case .4
OP= .4
Case .6
OP= .6
Case .8
OP= .8
Case 1
OP= 1
end select

else

if [CtachType] = "c" then
Select Case [Iprime]
Case .2
OP= .4
Case .4
OP= .6
Case .6
OP= .8
Case .8
OP= 1
Case 1
OP= 1
end select

else

if [CtachType] = "d" then
Select Case [Iprime]
Case .2
OP= .6
Case .4
OP= .8
Case .6
OP= 1
Case .8
OP= 1
Case 1
OP= 1
end select

end if
end if
end if
end if
-----------------------------------------------------------------------------

this is why i need the resulted raster to have only the values 0.2, 0.4, 0.6, 0.8 and 1.

but how can i do that?

regards

Jamal

Clip_86.jpg

Network Diagram.jpg

KylePurdon

It depends on what you want to do with the raster. You could just create a new raster where the field you want is the "Value" field and then just use that raster as a "zone". Or you could just change the symbology so that it represents the field you want.

Another method would be to covert your raster to a polygon based on the field you want, then use the dissolve and convert back to a raster. As far as I know there is no "raster dissolve" tool.

You could also use some sort of conditional statement as well if you want to dive into that.

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