All Questions
Tagged with erdas-imagine erdas-imagine or
283 questions
1
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1
answer
882
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Pro vs Con on using export to JPEG or JP2000 files for large imagery files
What is the preference among GIS Specialist and Remote Sensing Specialist using the JPEG vs JP2000.
Yes, I am aware of other compressed files such as ECW or MrSID...
I am more of concern of how to ...
- 4,139
1
vote
0
answers
96
views
What is the Pro or Cons for mosaic 30 GB jp2000?
Has anyone tried mosaic jp2000 imagery in ERDAS, ArcGIS , ENVI or any softwares that they have accomplished ?
I have three jp2000 files that is total about 28.1 GB that I want to mosaic with ?
- 4,139
0
votes
1
answer
397
views
Is TOA reflectance in floating point or DN? [closed]
After converting at radiance to TOA reflectance,is going to be in DN or floating point.
- 17
0
votes
1
answer
437
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Extract feature for automation method using ERDAS Imagine 2013 software?
I have Quickbird Satellite data, hence I want to extraction from Building foot prints using automation method.
Could you give whether its possible or not using ERDAS Imagine 2013?
- 843
1
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0
answers
82
views
/1.#IND error in ERDAS
I was applying the vegetation index
($n1_ttc0003r_16(2) - $n1_ttc0003r_16(4)) / ($n1_ttc0003r_16(2) + $n1_ttc0003r_16(4))
to a multispectral image, and the raster resulting on this operation had all ...
1
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0
answers
534
views
Retrieving Aerosol Optical Depth (AOT) from Landsat multispectral data
I need to retrieve Aerosol Optical Depth from Landsat multispectral datasets.
Has anyone successfully tried something like that before?
- 31
4
votes
1
answer
3k
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1m cell size equivalent value in decimal degree
I'm doing re-sampling pixel size in ERDAS 2014,I'm using input image(Indian terrain) in GCS_WGS_84 projection.
Now I have to keep out put cell size as 1m,what is the 1m equvivalent value in Decimal ...
- 1,419
1
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0
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114
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How to avoid background zero values in erdas imagine model maker? [duplicate]
Does anyone know how to avoid background black color/ zero value in background pixels in processed images using erdas imagine? Particularly in model maker. It's confusing in statistical calculation.
1
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1
answer
949
views
Could not open/read USGS raster file
I could not open/read the following .img file.
The document below says it is a raster file.
http://edc2.usgs.gov/1KM/land_sea_mask.php
I tried to open it using many ways such as Q-Gis software, and ...
- 179
1
vote
0
answers
397
views
Rectification of a lot of images using ERDAS IMAGINE
I want to rectify many images of same area but different dates at a time in ERDAS Imagine
1 I did this using Batch processing but I have no out put. Second I did reproject many images using Batch ...
- 41
2
votes
1
answer
2k
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ERDAS file not recognized as ERDAS Hierarchal File Architecture (EFHA)?
I am trying to do an accuracy assessment in Erdas using "user defined ground control points" (I collected the GPS points myselfin the field using a handheld GPS).
However, when I load the thematic ...
2
votes
1
answer
551
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same RMS error for different resolution data
if i rectify a low resolution data and high resolution data and both have same RMS error =1 then what would be rectify more accurately? means for which resolution this error is more acceptable ...
- 41
1
vote
1
answer
2k
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Enabling Erdas ECW files in gdal
I want to enable read support from Erdas ECW files in gdal on windows.
I have GDAL binaries from here and I also have a self compiled version.
When compiling myself I have found the options in nmake....
- 1,087
2
votes
2
answers
1k
views
Deriving slope angle value from DEM using ERDAS Imagine
I am trying to calculate the steepness of each pixels (30m) from the DEM of 2m resolution. I have made use of ERDAS Imagine - Slope function and returns a contour-like pixel image. The pixel value ...
- 37
4
votes
2
answers
4k
views
Shapefile Conversion to ERDAS Signature editor
I'm trying to run a supervised classification for an image. I was working with it in ArcMap and created some training data. I wanted to see if I could get a better result with Erdas Imagine using the ...
- 41
2
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2
answers
2k
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Shifting cloud mask in Erdas/ArcMap/Py Script [closed]
I have the task to mask out cloud cover in approximately 20 landsat 8 scenes. Creating the cloud mask for the "white part" is easy, but I need help in addressing the clouds shadow.
General ...
- 209
5
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1
answer
844
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Stereo Analyst & ArcGIS 10.1 - volume calculation
I use to perform analysis and imagery exploitation with the software above.
I have created a Stereo Analyst report with some 3d polygon by a stereoscopic block.
How do I calculate the volume of some ...
- 93
2
votes
1
answer
1k
views
Possible to use same signature file to classify images from different years? [closed]
I have Landsat images for the same area over 20 years (one photo per year in same season). I would like to detect changes occured in forested area like clear-cut and bark beetle outbreak over time. I ...
- 3,386
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 ...
4
votes
3
answers
3k
views
Matching colours in already mosaiced single image? [closed]
I have an already mosaiced image for a large area. I need to match colours in this single image. I do not have each image separately. I just have this large single image downloaded from GLS. How can I ...
- 91
1
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1
answer
2k
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Converting data type in ERDAS IMAGINE and ArcGIS for Desktop?
My tif image data type is float (i.e. my data is between -1 to +1) and I want to convert it into 8bit unsigned integer.
I used ERDAS IMAGINE import tool to do this, while converting it into img also.
...
- 61
1
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0
answers
58
views
Imagine 2014 displaying images with large no-data values
I'm starting to use Imagine 2014 after a recent upgrade. The images I'm using have data values in the range of approximately -.02 to 350.0. The no-data values bordering the data has a value of 2 ...
- 11
2
votes
2
answers
5k
views
Floating point to 8-bit unsigned raster conversion using ArcGIS for Desktop or ERDAS IMAGINE?
I have an image with value ranging from -1 to +1.
I want to convert this into 0-255 (8bit).
How can this be done using ArcGIS for Desktop or ERDAS IMAGINE?
- 61
1
vote
1
answer
4k
views
How to display the one band layer in pseudocolor using ERDAS Imagine?
I am a new user in ERDAS imagine and i found it hard to turn the single band raster data from grey color to pseudocolor using ERDAS imagine.
This process could be easier to be performed using ER ...
- 37
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
1
vote
0
answers
1k
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Calculating TOA reflectance from Radiance using Erdas Imagine for a Spot2 image
Using the SPOT equation ρ = π L/[E cos (θs) d-²] to calculate TOA reflectance from Radiance.
L was calculated using this equation [L = (X/A) + B]
d was calculated by converting date to julian day ...
- 129
2
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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
1
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1
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1k
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DN to TOA reflectance for SPOT images using Erdas Imagine
I would like to convert DN to TOA reflectance in Erdas Imagine 2013. I see there is a way of doing this for Landsat7 in the Radiometric tab.
How can I do this for SPOT2,4,5 images?
- 129
1
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0
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79
views
Water grey levels - remote sensing [closed]
by viewing two bands in erdas imagine the grey levels of the water differ. on the one image as below the water is dark and the other image the water is light. why is that? what cause the difference?...
- 81
-1
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1
answer
672
views
Performing image rectification to a jpeg using ERDAS Imagine [closed]
I am trying to rectify some images on ERDAS Imagine. These images are jpegs. They have no projection data. How do I do this?
2
votes
2
answers
545
views
Normalizing landsat image pixels prior to classification?
I have 5 different years (all in the same month) of Landsat TM imagery to perform classification on and I would like to know whether there is a technique to normalise the pixels in each image so my ...
- 21
1
vote
1
answer
1k
views
Creating batch file from ERDAS IMAGINE Spatial Modeler?
How to create batch file from the ERDAS IMAGINE Spatial Modeler?
I want to do the same process to different input images, something similar which we can do by batch processing of the existing ...
- 11
1
vote
1
answer
654
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create a vegetation mask using Landsat 7 [closed]
I'm working on a very large study area. The aim is to create a vegetation mask representing only pines. I'm using Landsat 7 images. Since the recordings were made in the winter it's pretty easy to ...
- 292
7
votes
1
answer
557
views
What are pros and cons of forcing square pixels on reprojection?
I am using Erdas Imagine 2014 to reproject 4-band raster data from GRS 1980 NAD83 Lambert Conformal Conic (ft) to UTM GRS 1980 NAD83 North UTM Zone 11 (m). Unlike ArcGIS, Erdas provides the option to ...
- 51.8k
1
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1
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3k
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How to rescale data ranges in ERDAS?
I have an Normalized Difference Vegetation Index(NDVI) and Enhanced vegetation index (EVI) layer and I want to re-scale their data ranges to value ranges from 0–to–1, in order to optimally stretch the ...
1
vote
1
answer
325
views
Problems using ATCOR for Erdas Imagine '13
An output from ATCOR processing (besides an atmospheric correction and dehazing) is expected to be an image containing true reflectance values (instead of raw input DNs). As far as I know such data ...
- 3,593
5
votes
2
answers
3k
views
Erdas python scripting help
I want to write scripts for Erdas in Python.
I downloaded some Python examples here but I could not make much.
Where can I get the full Help material for Erdas python scripting?
- 1,419
1
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1
answer
1k
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How to create an Erdas batch list file (.bls) using Python?
How can I generate the Erdas batch list file (.blf) using Python? For example, I want to run a 5x5 median filter in the Batch Command Editor using a subset of images within a folder. Erdas provides ...
- 51.8k
1
vote
1
answer
196
views
Creating training areas for parametric classifcation
I am creating a signature file for a supervised classification for a subset of a LANDSAT image. I know what classes I would like to create, and have identified ideal areas for training. However, I am ...
- 53
-2
votes
1
answer
2k
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MODIS MOD13Q1 ndvi calculation
i have downloaded the modis MOD13Q1 from usgs glovis in hdf format. how i will convert it into original ndvi value by multiplying scale factor of 0.0001. I am using ERDAS 9.1 & ENVI 4.7.
Can you ...
1
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0
answers
887
views
Conversion problem of projection of MODIS LAI from sinusoidal to geographic
I am trying to change MODIS data's (LAI) sinusoidal projection to geographic. Actually I did it. But when I reproject it by ERDAS, the output LAI raster moved about 10 km to west side of actual ...
- 315
1
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2
answers
2k
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How to remove sandy dots in an image?
I am processing a LandSAT image for geological purposes. After some processing there are so many sandy dots in the image. To get clear geological formation as a polygon I want to remove small sandy ...
- 379
0
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1
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265
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how to multiply and group values of NDVI in Erdas
I have downloaded the MODIS data for calculating the NDVi but the ranges of values in its attribute table ranges from -32768 to 9830 i want to club the similar values upto 2 decimal places and also ...
- 49
2
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1
answer
2k
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Stacking overlapping rasters, keeping cell values on top?
I have a land cover classification that consists of three files. One file is the LCC for the western half of my study area, another covers the eastern half (these two overlap in the middle), and the ...
- 1,294
5
votes
4
answers
11k
views
Determining which "color" each image band represents?
I have a satellite image that has a few bands in it. But I don't know what colors they are supposed to represent, nor do I know where to look for this information--the file's metadata say nothing ...
- 83
2
votes
1
answer
2k
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split multi-band raster to separate rasters in ERDAS IMAGINE
I am currently using ERDAS IMAGINE 2013. I have a 28 Band MODIS image. Is there any way in IMAGINE I could split the 28 bands of the MODIS image into single band images?
- 446
2
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0
answers
1k
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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
3
votes
1
answer
2k
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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
1
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0
answers
48
views
Determine sun elevation without header file?
I have some AWiFS and LISS-III data that I'm trying to convert from at-sensor spectral radiance to top-of-atmosphere reflectance. The problem is, the data didn't come with any header file. All I ...
- 151
6
votes
1
answer
2k
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Methods of cloud shadow detection for Landsat data?
Detecting clouds doesn't seem to be much of a problem, rather the challenge is in selecting cloud-shadow classes that don't also include coastal areas, agriculture, etc. For a project I'm working on, ...
- 151