[erdas-l] Modeler: Replace value
Fairuz Mohamad
I have two files, A and B. I want to replace/subsitute pixel value(selected only) in file A with the pixel value in file B ( at the same location in file A) and create a new raster file. but the other pixel value in file A maintain, so new raster file contain , pixel value from file B(after replace) + pixel value file A
How to write it in modeler?
%2=%1
if %2<=0 then
endif
%2=file B
%1=file A
%3=new file
<=0 means the pixel less or equal zero
Here, is the simple model in other software but how to make it in erdas>modeler
A journey of thousand miles starts with one step.Good judgement comes from experience and experience
comes from bad judgement.."pacat" From: Donn Rodekohr <ROD...@auburn.edu>
To: ERDAS Discussion List <erd...@lyris.dundee.net>
Sent: Monday, March 2, 2009 11:16:15 PM
Subject: RE: [erdas-l] Modeler: Thematic Level Slice of Terrain
James,
Wan stole my suggestion. Good for Wan.
Secondarily, the CONDITIONAL statement works by accepting the 1st true
condition and outputting the result. Therefore, you do not have to use
both the ends of your classification scheme within the statement. For
example, your conditional statement of
CONDITIONAL {
(($n1_srtm30) lt 0) 1,
(($n1_srtm30) == 0) 2,
((($n1_srtm30) gt 0) AND (($n1_srtm30) le 5)) 3,
((($n1_srtm30) gt 5)
AND (($n1_srtm30) le 10)) 4,....
will get the same results as this statement:
CONDITIONAL {
(($n1_srtm30) lt 0) 1,
(($n1_srtm30) == 0) 2,
(($n1_srtm30) le 5)) 3,
(($n1_srtm30) le 10)) 4, ...
or if you want to descend rather than ascend
CONDITIONAL {
(($n1_srtm30) lt 0) 1,
(($n1_srtm30) == 0) 2,
(($n1_srtm30) Ge 500)) 24,
(($n1_srtm30) GE 495)) 23, ...
In essence the CRITERIA function is an automated interface to the
CONDITIONAL statement. Use which ever is most easily understood by
you.
Also, since the modeler edit box can receive pastes from an outside
source, I have created spreadsheets with variables that will generate
the CONDITIONAL statements of varying lengths and varying increments.
with some judicious uses of IF and CONCATENATE you can make the spatial
modeler command and then copy/paste it directly into you Spatial model.
since I am essentially a lazy typist I'll use a spreadsheet to generate
the code rather than editing each line within the SM edit box. I'm more
prone to find and fix an error using this method.
Donn Rodekohr, Spatial Analyst
230 Funchess Hall
Agronomy and Soils Department
Auburn University
Auburn, AL 36849
334-844-3989
>>> Wan Bakx <ba...@itc.nl> 3/2/2009 2:14 AM >>>
Dear James,
The Criteria function is designed for that. You can quickly make a
table
with output values and corresponding ranges e.g.
Output $n1 LnDEM
1 <=1000
2 <=1100
3 <=1200
Of course you would have to change the Data type and File type of the
output file to unsigned Byte and Thematic layer respectively.
Etc
Wan
-----Original Message-----
From: erd...@lyris.dundee.net [mailto:erd...@lyris.dundee.net] On
Behalf Of James
Sent: Saturday, February 28, 2009 2:39 AM
To: ERDAS Discussion List
Subject: [erdas-l] Modeler: Thematic Level Slice of Terrain
I am building a model to create a thematic level slice from terrain
data
and was wondering if there might be an easier way to accomplish this.
As an input, I have a continuous terrain file (signed 16-bit). I'd
like
to create an unsigned 8-bit thematic image, sliced at 5m vertical
intervals (e.g., Class 1 = 0m-5m; Class 2 = 5m-10m; Class 3 = 10m-15m,
etc).
Here is a sample of my function definition (from an older version).
This
model works fine, but writing all of these individual 5m intervals up
to
500m (or greater) takes so much time! I actually built this entire
model
up to 500m, saved it, then the modeler crashed and I cannot re-open
the
model!
Perhaps there is a function that will automatically create the level
slice based on an interval I input???
CONDITIONAL { (($n1_srtm30) lt 0) 1, (($n1_srtm30) == 0) 2,
((($n1_srtm30) gt 0) AND (($n1_srtm30) le 5)) 3, ((($n1_srtm30) gt 5)
AND (($n1_srtm30) le 10)) 4, ((($n1_srtm30) gt 10) AND (($n1_srtm30)
le 15)) 5, ((($n1_srtm30) gt 15) AND (($n1_srtm30) le 20)) 6,
((($n1_srtm30) gt 20) AND (($n1_srtm30) le 25)) 7, ((($n1_srtm30) gt
25)
AND (($n1_srtm30) le 30)) 8, ((($n1_srtm30) gt 30) AND (($n1_srtm30)
le
35)) 9, ((($n1_srtm30) gt 35) AND (($n1_srtm30) le 40)) 10,
((($n1_srtm30) gt 40) AND (($n1_srtm30) le 45)) 11, ((($n1_srtm30) gt
45) AND (($n1_srtm30) le 50)) 12, ((($n1_srtm30) gt 50) AND
(($n1_srtm30) le 55)) 13, ((($n1_srtm30) gt 55) AND (($n1_srtm30) le
60)) 14, ((($n1_srtm30) gt 60) AND (($n1_srtm30) le 65)) 15,
((($n1_srtm30) gt 65) AND (($n1_srtm30) le 70)) 16, ((($n1_srtm30) gt
70) AND (($n1_srtm30) le 75)) 17, ((($n1_srtm30) gt 75) AND
(($n1_srtm30) le 80)) 18, ((($n1_srtm30) gt 80) AND (($n1_srtm30) le
85)) 19, ((($n1_srtm30) gt 85) AND (($n1_srtm30) le 90)) 20,
((($n1_srtm30) gt 90) AND (($n1_srtm30) le 95)) 21, ((($n1_srtm30) gt
95) AND (($n1_srtm30) le 100)) 22, ((($n1_srtm30) gt 100) AND
(($n1_srtm30) le 105)) 23, (($n1_srtm30) gt 105) 24}
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Lilik Budi Prasetyo
It seem conditional function within erdas modeler can be applied.
Lilik
Bogor Agric. Univ.
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Adrian Benitez
Fairuz,
Make a simple model maker. Two inputs, one function and one output. Connect the inputs to function, and the function to output. Set the inputs with your raster files A and B. Set the output with a new file name (C).
In the function write one of these sentences. Choose one of them according to your preference/objectives.
EITHER $fileB IF ($fileA <= 0) OR $fileaA This condition copy A to C(new file) but replaces with B when A is less or equal to zero
EITHER $fileB+$fileA IF ($fileA <= 0) OR $fileaA This condition copy A to C(new file) but replaces with A+B when A is less or equal to zero
Regards,
Adrian E. Benítez, Ing. Agr.
Responsable Geographic Imaging, Aeroterra S.A.
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Donn Rodekohr
If I understand the problem correctly I think that this Modeler
statement will do what you are asking
Input files: $n1_A, $n2_B
Output file: $n3_C
Function statement:
Either $n1_A + $n2_B if ($n1_A == $n2_B) or $n1_A otherwise
This statement will add A+B to every location where A=B. If you want
to restrict the summation to a specific values, 16 and 49 for example,
then I would suggest the following CONDITIONAL statement be used:
Conditional {
($n1_A == 16) $n1_A + $n2_B,
($n1_A == 49) $n1_A + $n2_B,
(default) $n1_A}
This statement will scan through file A and will repeat the values for
A unless the value is equal to 16 or 49. In that case it will add A+B.
Hello,
%2=%3
endif
________________________________
James,
Wan
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Fairuz Mohamad
but I'm very sorry for a minimum typing error.
%2=%1 ----------------this command will create new file with the value same with file A
if %2<=0 then ................this command will search any value less or equal to zero then
%2=%3 ...............the zero value will replace with value from file B, so automatically "new file" contain no zero value
or less than that.
endif
%2=new file ( previously, file B)
%1=file A
%3=file B (previously, new file)
<=0 means the pixel less or equal zero
A journey of thousand miles starts with one step.Good judgement comes from experience and experience comes from bad judgement.."pacat" Subject: RE: [erdas-l] Modeler: Replace value
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Adrian Benitez
Fairuz,
In some cases, I prefer to use a general math expression instead of conditional statement syntaxes. You can prove this way.
For example, you can replace the following ERDAS conditional statement
EITHER $fileB IF ($fileA <= 0) OR $fileaA OTHERWISE (This condition copy A to C(new file) but replaces with B when A is less or equal to zero)
By this algebraic expression :
$fileB*($fileA <= 0) + $fileaA *($fileA > 0)
If (relation) is true, the system returns the value 1 (one) . If it is false, a 0 (zero) will be returned.
Thus, you can use the neutrality of some math operators and relational operators, instead of specific conditional commands
In some systems, value -1 is the result from true conditions.
Adrian E. Benítez
Aeroterra S.A.
Buenos Aires. Argentina
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