All Questions
120 questions with no upvoted or accepted answers
11
votes
0
answers
1k
views
What is the convergence threshold for ArcGIS Iso Cluster?
The ArcGIS tool Iso Cluster Unsupervised Classification does not seem to have any documentation on the convergence threshold used in the tool. To compare, Erdas Imagine has all of the necessary ...
- 51.8k
4
votes
0
answers
379
views
How to increase Compression Memory for ECW Opacity Builder
I am attempting to build opacity within an ECW file using ECW_Opacity_Builder.exe from APOLLO Essential Utilities 2014, which has worked flawlessly many times before.
When attempting to build opacity ...
- 25.7k
4
votes
0
answers
756
views
How to remove black pixels in Landsat image
Does anyone know how I can remove these black pixels around the edge of this Landsat image? They appeared when I layer-stacked the bands in ERDAS IMAGINE - they were not there in the separate band ...
- 861
3
votes
0
answers
273
views
Extracting cells from raster by attribute in ERDAS Imagine
I have a raster file that gives me the slope of all the hills and mountains in an area in degrees (0-90) and I need to extract all the cells which are >= 45 with an operator in the model builder. I ...
- 113
3
votes
1
answer
2k
views
Using Python script to stack layers from multiple directories and produce multiple outputs in ERDAS?
I am using ERDAS Imagine 2013 and am trying to create a Python script that takes lists created in another script containing the path to each scene's raw data folder and base image ID's (for example ...
- 151
3
votes
0
answers
135
views
QGIS crashes when trying to open ecw files
I added Ubuntugis unstable repo and installed Qgis, libgdal-ecw-src, libecwj2-3.3 but still does not work.
When I attempt to open an ecw file with Qgis it crashes and tells me:
'std::length_error': ...
2
votes
0
answers
118
views
Do PNG files suffer performance for scaled read over ERDAS Imagine (.img) files?
So I have a 20 GB in size Raster Image in .img format. Though I will be examining the code, to find out why, I am AMAZED at how quickly QGIS renders the entire file in a scaled format, and prior to ...
- 21
2
votes
0
answers
66
views
Solving color correction of LISS IV Multispectral image
I have a LISS IV multispectral images (radiometric resolution of 10 bit per pixel) taken in different months 4 tile in January and 2 tiles taken in February.
While mosaicing, I got a different color ...
- 21
2
votes
0
answers
694
views
Layer stacking Multispectral reflectance imagery in ERDAS Imagine 2016
I have Green, red, Red edge and Near infra-red reflectance maps captured with a Parrot Sequoia camera and post processed with Pix4D.
They are all Single Float Tiff files, around 500Mb in size.
I ...
- 65
2
votes
0
answers
307
views
ECW support in QGIS3 for Mac
I reinstalled QGIS3 on a new mac but cannot get ECW support to work anymore.
I previously used QGIS3 on another Mac, where I installed ECW support using the "old" method (see this question).
This ...
2
votes
2
answers
832
views
Projection shapefile
I created a shapefile of Sundarban area Bangladesh. Here it is:
Here is the projection information about it:
I want this shapefile to project upon an image which is here [I downloaded it from ...
- 129
2
votes
0
answers
143
views
Improving FLAASH atmospheric correction to accurately represent subtle features in a target's spectral profile?
I am attempting to use ERDAS target detection models to detect/differentiate a specific type of soil from a general background. We have gathered spectral signatures of the target soil in the field ...
- 21
2
votes
0
answers
217
views
Erdas 2014 process time signature editor supervised classification
I am currently using erdas imagine 2014 with 64bit OS. Basic configurations of my computer are; i7 3820 3.60 GHz CPU, 16 GB memory (RAM), gforce GTX 680 SLI 256 bit Graphic card ( 2GPU ), 250 GB ssd. ...
- 21
2
votes
0
answers
308
views
How Does Erdas calculates the ground coordinates for each pixel in the image
How Does Erdas calculates the ground coordinates for each pixel in the image
I have a conceptual question regarding photogrammetry, what is the formula used by Erdas to find the (X,Y,Z) on ground. ...
- 1,044
2
votes
0
answers
56
views
Erdas LPS : how to rename points_ID values?
I'm working with ERDAS LPS 2014, i would like edit the name given for my GCPs and TPs (add the following suffix : "_w").
I tried to do that using the "formula" menu... in vain. I did not find a ...
- 919
2
votes
0
answers
274
views
Erdas Imagine 2011 removing points from polygons
I've been running into an issue with Erdas Imagine 2011. I have been creating training sites in a polygon shapefile to use with a decision tree classifier but it seems like the software keep ...
- 81
2
votes
0
answers
238
views
Data format in ERDAS IMAGINE 2014?
I performed radiometric correction analysis on Landsat 8 image ( format: integer unsigned 16 bit) in ERDAS IMAGIN 2014.
However, the output image would be created if I could select format: float 32 ...
- 21
2
votes
0
answers
922
views
Opening image in ERDAS Imagine
I am trying to open a .img image fil in ERDAS Imagine and I keep getting the message "End of file reading dictionary" with ERDAS not responding. The program gets stuck here and I have to shut it down. ...
- 21
2
votes
0
answers
431
views
Division by zero error in Erdas imagine 2014
I'm running a Model maker to divide a couple of rasters. The function is as follows:
($n1_band1 / $n2_band2)* 100
There is no zero in both images (both of them are integers). However, I'm still ...
- 21
2
votes
0
answers
101
views
How to overlay Radiance (Top-of Atmospheric radiance) over Digital Numbers Image?
I am trying to process INSAT-3D images, which contain six different bands. I have to extract each and every band form the .h5 data file, so when I extract first band (MIR) band form the data set, I ...
2
votes
0
answers
432
views
Run an ERDAS Imagine pmdl (or bcf) via Python?
How (or is it) possible to run an Erdas Imagine .pmdl model from a Python script? I have successfully run .eml models but cannot get the syntax right for .pmdl
Here is what the line I want to run ...
- 291
2
votes
0
answers
69
views
How to create Strips with GCP point distribution for raw GeoEye satellite imagery?
I have raw GeoEye satellite imagery, I just want some guidelines for creating a strip map with GCP distribution. We need to make orthorectification for raw GeoEye satellite imagery, I think it's ...
- 1,123
2
votes
0
answers
1k
views
Why image do not color match when many Landsat images are mosaicked in ERDAS?
When I try to mosaic Landsat images in ERDAS I get as result image with discordance in colors.
I tried histogram matching but no success.
The images were captured between March and May.
- 21
2
votes
0
answers
686
views
Segmentation Image used to classify RGB image in ERDAS and GIS
My ERDAS 2013 does not have the advanced Image Objective Extension for feature extraction..
I am using thus the tool Image Segmentation (Unsupervised -> Image Segmentation) to classify my RGB image ......
- 49
2
votes
0
answers
461
views
Importing GPS coordinates to extract multiple DN values in ERDAS
I have a set of GPS points (stored as a csv for now) and would like to import these points to ERDAS to find the DN values associated with each location.
I am able to import a SHP to ERDAS but the ...
- 53
2
votes
0
answers
796
views
How to add new raster store and publish for ECW fromat in GeoServer 2.4-RC2?
I am using GeoServer 2.4 RC2 and Tomcat7 on windows xp OS. I have extracted the gdal-data.zip (2.4.0) and geoserver-2.4-SNAPSHOT-gdal-plugin into Tomcat 7.0\webapps\geoserver\WEB-INF\lib. Now ...
- 1,051
2
votes
0
answers
398
views
Extract road defects from terrestrial LiDAR, in Erdas 2012 or ArcGIS10.1
I'd like to extract road defects from a lidar point cloud. So, wherever a road surface drops or raises by a few mm relative to 100 cm around it.
I know it's possible but I just can't find or figure ...
- 8,298
2
votes
0
answers
446
views
ENVISAT ASAR .N1 file is not being opened by ERDAS IMAGINE 2011
I am not able to open ENVISAT ASAR .N1 file in ERDAS IMAGINE 2011. The software has direct read option for files of this format. Whenever I try to open the file, software closes automatically giving ...
- 89
2
votes
0
answers
190
views
How to change the order of a raster in order to create mosaic with MosaicPro (Erdas 9.2)?
Is there a way to reorder the input files so I can control which ones are on top of the others?
- 309
2
votes
0
answers
432
views
HCS resolution merge (artifacts and dead pixels)
I try to use ATCOR and HCS resolution merge to preprocess urban Worldview-2 data. Applying the HCS algorithm without initial atmospheric/radiometric correction works just fine, but if I apply ATCOR ...
- 21
1
vote
0
answers
36
views
Opening .img file created in Erdas Imagine 2023 in Erdas Imagine 2022
I am having an issue working with a file created in Erdas Imagine 2023 in Erdas Imagine 2022. I ran a tool with the output .img. However, the .img format seems to be different in Erdas 2023 vs Erdas ...
- 11
1
vote
0
answers
33
views
Installing libecwj2-3.3 on Mac
I am trying to install libecwj2-3.3 on MacOS 14.0.
I have added all the patches as well from https://sourceforge.net/projects/libecw-legacy/ bu still the installation is failing with below error.
&...
- 11
1
vote
0
answers
748
views
Clean/Precise script to Install GDAL+ECW drivers in QGIS 3.22.16 and Ubuntu 22.04
This is what I did so far:
This is how I installed ecw drivers and gdal:
#ECW (BORRAR ANTES LA CARPETA /usr/local/hexagon si existía
## Unzip ECW libraries and install. Está en la carpeta public de ...
- 3,494
1
vote
0
answers
145
views
How to Copy Paste ECW maps together?
I have found previous threads but they are different enough to not be very useful to me.
I have the pages of a reference atlas for a city that were photo scanned and then placed in ECW files.
There ...
- 33
1
vote
0
answers
200
views
How can I match the colors between the subset and the original image?
I have test subset using an AOI, and I have unchecked the "Ignore zeros in stats." option in the subset dialogue box. The difference in colors may have been cause by the histogram re-...
1
vote
0
answers
50
views
Supervised classification in parts
I have an image from 1990 (res 30m, also clouds) for an area equal 2100km2 and when I performed the supervised classification, the software (ERDAS) confuses the classes that look similar. Is it ...
- 11
1
vote
0
answers
216
views
Using ERDAS Imagine 2020 orthophotos
I am dealing with how to figure it out how to export an orthomosaic from my Agisoft Metashape because when I did the merge chunks there. When you merge there, it doesn't provide what I need because of ...
- 4,139
1
vote
0
answers
738
views
R can't work with ecw while gdal/qgis does. Ubuntu 20.04 config
I'm an Ubuntu 20.04 user with all configured to use .ecw raster format. I can read these files in QGIS (3.10) and work with them without a problem. This is what I get in console:
$ gdalinfo --...
- 3,494
1
vote
0
answers
205
views
Why does a raster that consists of 3 bands appear greyed out?
I have a raster that is formed by stacking the bands blue, green and red of "Landsat 8", when it is displayed on Erdas Imagine 2015 it appears as if there is a semi-transparent grey layer over it, the ...
1
vote
0
answers
158
views
Unsupervised classification in ERDAS imagine
I am trying to make a classification to run some index ( like NDVI) to see the change over time using the image difference function. Is it possible to do an unsupervised classification on one image ...
- 11
1
vote
0
answers
243
views
ECW Exception when exporting a map in QGIS
Since monday Qgis has been unstable, everytime I try to export a map (or worse an atlas) it has crashed.
I get the folowwing message :
---------------------------
ECW Exception
---------------------...
- 11
1
vote
0
answers
85
views
Reprojecting a SHP in QGIS to used it in ERDAS
I´m trying to created a AOI in ERDAS with a shapefile, but this shapefile had a projected system different to system that my image has, because of that I changed the projected system of the shp in ...
- 131
1
vote
0
answers
135
views
Vector-Viewing Properties on Multipoint Geometric Correction in Erdas Imagine 2014?
I am following some old instructions that are not up to date with my latest version of Erdas Imagine. Where can I find the Vector viewing properties within the Multipoint Geometric Viewer?
The ...
- 59
1
vote
0
answers
280
views
Raster clipper is giving negative coordinates in QGIS?
I have an ECW file that I want to clip and to convert to MBTILES. It's on ITM CRS, and when I use clipper on QGIS the output is in the same coordinates but negative! So 250000, 750000 becomes -250000,-...
- 507
1
vote
0
answers
609
views
landsat 8 images in ERDAS imagine 2014 is not mosaicking properly
I am trying to merge all 4 landsat 8 images in order to create land use land cover map, but its not merging properly.I layerstacked this images before merging. Should i download landsat images which ...
- 85
1
vote
0
answers
38
views
Image displays in 3 RGB stripes across the surface
I layerstacked the Image in the screenshot above, but it is displaying in 3 stripes of RGB. Anyone who knows what the problem could be?
- 11
1
vote
0
answers
411
views
Attribute table shows histogram/pixel count for a thematic raster image, but on enquiring, every pixel's value is zero
I have a thematic raster image containing 18 land use classes (like built-up, water bodies, plantations, forest, etc.). When I display this image in a GIS application (Arcmap/Erdas IMAGINE), the map ...
- 11
1
vote
0
answers
2k
views
Ecw file to something else
I have an ecw aerial map of part of Denmark, I need to import that aerial map into another program, and to do that I need to change the format to a picture. The georeference doesn't matter.
I have ...
1
vote
0
answers
324
views
Mapnik with ECW on Ubuntu
Does anyone know how to build a mapnik with an ECW driver on Ubuntu.
There is a successfully installed GDAL 2.2.1 with ECW support.
Install ECW 3.3
wget http://www.kyngchaos.com/files/macosxport/...
- 366
1
vote
0
answers
388
views
How to add ecw image to GeoServer(ImageMosaic)?
I'm trying to add ECW to ImageMosaic and have an error.
At first i'm add storage:
Then a click button "Relase":
and get this error:
https://i.sstatic.net/6HJ8j.png
org.apache.wicket....
- 21