All Questions
162 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
76
views
Stacking lidar-derived height raster as ancillary data for segmentation in ENVI?
I get a a black and white image after following these steps. Does anyone know why I'm not getting a color aerial image beneath the mask?
My setup consists of these steps:
I mosaicked several NAIP ...
- 319
3
votes
0
answers
155
views
NoData and Multiband Calculations
I was recently trying to perform some band math calculations in multiband images. I have a big chunk of images witch contains more than 300 bands (dates) each. So I first choosed ENVI to do this ...
- 31
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
0
answers
370
views
Import GPS SINEX (for velocity analysis) into Sarscape or processing with others software
I try to import GPS snx. into Sarscape 5.2 (use GPS Import tool) and getting error
115) ) gps_type : [sinex]
116) ) generate_kml : [OK]
117) ) generate_shape : [OK]
118) ) ...
- 452
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
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
197
views
When to rescale reflectance data to calculate vegetation indices
I'm attempting to calculate a number of vegetation indices using hyperspectral AVIRIS data in ENVI. Some of these indices are normalized, such as NDVI, whereas others are not, such as the Transformed ...
- 425
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
2
answers
3k
views
ENVI band math incorrect values
I'm attempting to calculate vegetation indices in ENVI 5.2 using level-2 AVIRIS data in band math.
The indices I'm working with are Vogelmann Red Edge 2, normalized difference red edge, and red edge ...
- 425
2
votes
0
answers
240
views
Supervised classification using endmember spectra (using ENVI 5.1)
We are trying to map land cover classes over a small watershed. We have selected training sites (during a field campaign in early 2017) and determined their spectral profiles on a Landsat 8 image ...
- 143
2
votes
0
answers
51
views
Register an image using mutual information
I want a procedure for registering two images based on their mutual information. I took a pair of georeferenced radar images of the same location, edited the metadata of one so its position was off by ...
- 145
2
votes
0
answers
436
views
Computing stats with data ignore values - ENVI classic
I'm using ENVI classic (5.4.1) and trying to compute basic statistics from a Landsat-8 scene. When I mask out certain pixels (water set to 'No Data', for instance) the built-in ENVI statistics still ...
- 21
2
votes
0
answers
355
views
ENVI shows colors of different RGB code the same in a bitmap image wrongly?
As you see in this picture which I've captured in MATLAB, there are two colors.
Red with the RGB code (255,0,0)
Brown with the RGB code (138,139,1)
I've tried to show the same picture in ENVI, ...
- 731
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
406
views
Linear Spectral Unmixing in ENVI 5.3
Trying to perform some Linear Spectral Unmixing on a LandSat 7 scene. I have 6 bands, and after MNF-transformation have kept 4 of them.
I want to perform a Vegetation, Impervious surface, Soil (V-I-S)...
- 41
2
votes
0
answers
454
views
DSM and buildings height
How can I create a Digital Surface Model in order to collect the height of buildings and what's exactly needed to create a Digital Surface Model?
Any software provide creating it (ENVI or PCI ...
- 31
2
votes
0
answers
263
views
Producing a high-res jpeg with grid from GEOTIFF and Shapefile in Python
I have a bunch of 4-band GeoTIFFs that I would like to save as high resolution JPEG images. But, in the output image, I also need a separate point .shp to be overlayed and labeled with one of the ...
- 1,545
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
43
views
Snapping vectors to vertices for ROI delineation?
I am trying to manually extract a set of ROIs in ENVI 5.0.
However, I can't seem to successfully line up the vector to be flush with the boundary of the pixels, which means I don't have fine-tune ...
- 185
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
790
views
Interpolating values for NaN pixels using ENVI?
I'm currently using MODIS data and am running into problems with NaN values in the final product caused by clouds. I'm interesting in a simple way to spatially interpolate (fill in) these NaN values. ...
- 21
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
927
views
ENVI: Postclassification, remove pixels of certain size
I did a classification over multiple Landsat imagery in ENVI 5.1, which turned out not too bad (ice and snow in Cyan in the picture below). Now I am about to do a postclassification to filter out ...
- 437
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
68
views
"Back calculating" to quantify the "atmospheric effect" of water vapor or other gases in a "corrected" hyperspectral image using QUAC?
I know that when using FLAASH in ENVI, you can produce a water vapor map (caveats considered) from your atmospheric correction.
My question is if it is possible to "back-calculate" a water vapor map ...
- 21
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
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
35
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
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
376
views
Extracting spectral signatures from ROI using ENVI5.3
I used ENVI's Band Math functionality for calculating a certain index to find out the dominance of a mineral. The output is one monochrome band as seen below, I really need your help to learn how to ...
user168625
1
vote
0
answers
50
views
Correcting effect of solar elevation angle in tagged areas for Landsat 8 L1T images using ENVI
Someone said the L1T images did not correct the effect of solar elevation angle.
I want to know how can I get the parameters for doing such correction in ENVI?
- 141
1
vote
1
answer
518
views
Converting ENVI file to TIFF using ArcPy
I have ENVI files one ASCII file .hdr and a flat_binary raster file which is a file without an extension
I'd like to convert them to TIFF files
These are the steps I followed:
Rename flat_binary ...
- 11