A remote sensing and GIS software.

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1answer
25 views

Erdas Imagine DN to TOA reflectance for SPOT images

I would like to convet 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?
7
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1answer
114 views

What are the 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 ...
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1answer
21 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?
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1answer
85 views

How can I choose values from stacked raster images according to location of ROI

Before I choosed ROI on land surface temperature (LST) images and obtained pixel values of LST. Now I need pixel value of another images which are stacked multi-band image. My main purpose is to ...
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1answer
173 views

How to modify 2 raster images to have the same resolution?

I have data for 2 rasters images that have different resolutions: z downloaded from trmm An MSAVI2 output image. For calculating the correlation between them, the data has to be in the same ...
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1answer
56 views

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 ...
2
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1answer
890 views

Open Source Alternatives to Erdas ATCOR

I have been using Erdas ATCOR for atmospheric correction of ASTER imagery. What opensource options exist for atmospheric correction of ASTER Level 1B products? I'm primarily interested in converting ...
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1answer
25 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 ...
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1answer
21 views

Which format is more convenient to publish in Erdas Apollo?

I am from Bolivia and I need to publish some Satellite images in Erdas Apollo. My question is Which format is more convenient for publish in this software?, because I have Landsat5 TM images in TIFF ...
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0answers
16 views

MODIS MOD13Q1 extract ndvi value [duplicate]

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 IMAGINE 9.1 & ENVI 4.7. ...
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0answers
43 views

How to generate GML by extracting heights from DEM?

I am trying to generate GML using satellite images for geometries of various objects, and I propose to use DEM of the corresponding area in order to extract heights. I already have a piece of ...
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1answer
28 views

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 ...
0
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1answer
108 views

'erdas apollo how to enable this service'?

we have installed ERDAS Apollo, and open the welcome page and tell us " you've setup ERDAS APOLLO 2011, v11.0 successfully", but test Sample HTTP requests and got same error: eg: when test ...
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0answers
33 views

Grouping of NDVI values in erdas Imagine

I am trying to extract NDVI values from MODIS image i have image of my study area, when i look at the attribute values of image in Erdas i get the value ranging from -32768 to 9820, I want to create ...
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0answers
38 views

Script to stack multiple landsat bands in different folders

I wanted to find out if there is a possible script I could use to stack landsat bands into a single image, and then apply that stack command to multiple folders (I have about 100 landsat scenes that ...
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0answers
121 views

Use a 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 ...
0
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1answer
40 views

Running Erdas command in MS-DOS

I have generated the following command line in ERDAS, and want to run it in MS-DOS. Getting an error- "system cannot find the path specified". I have checked the path by opening it in windows ...
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0answers
18 views

Which georeferencing method for Himalayan Awifs-Awifs registration

I would like to know which georeferencing method would provide the best result for Himalayan region in-case of Awifs(Raw) to Awifs(master) georeferencing.. I have already tried polynomial ...
2
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2answers
178 views

Digital Number (DN) on satellite imagery? [closed]

How would I know if any of the satellite imagery (Landsat, ASTER, Quickbird and so on) have DN or Digital Numbers such as integer or uninteger on its pixel. I download from the USGS EarthExplorer and ...
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0answers
15 views

GeoEyes stereo Image

We have 4 stereo GeoEyes images. We work with ErdasImagine 2014 when we generate a blk file after reading the images we see this error: "Unsupported Compression type". Please help us. Best Regards
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2answers
235 views

NoData Value = 0, problem when creating NDVI, Erdas

I try to create an NDVI from Landsat and ASTER satellite images using Erdas Imagine. In Erdas, the satellite images have a nodata value of 0. After creating an NDVI, the nodata value is still 0, but ...
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1answer
82 views

How to export raster value into excel or ASCII [duplicate]

I'd like to get all pixel values of time series NDVI image to find regression coefficient to smooth the abnormal NDVI value through the time. So that firstly, I want to export values of raster into ...
0
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1answer
174 views

How to make Mapnik render Erdas images in RGB instead of grayscale?

I have some orthophoto files (Erdas Imagine format) enclosed in a vrt file. When I view it in any desktop GIS it has proper RGB colors, but when I use the vrt in Mapnik to render some tiles, I get ...
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1answer
56 views

Is there any method to choose the value of each pixel according to land cover

I have 2 images; one is land cover image (imgA) and monthly mean temperature image (imgB). I'd like to choose value of each pixel from imgB corresponding to imgA. WhaT I expected is each pixel of ...
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0answers
44 views

What does “unsupported bin funcion type” error in ERDAS mean?

I want to open a set of .img files in ERDAS which are output files of zonal statistic function in ARCGIS. Before running the function, all images can be opened in ERDAS. After calculating zonal mean, ...
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4answers
94 views

Why does ASTER created -0 to 0 instead of -1 to 1? [closed]

On my previous question on ASTER I need some more information on ASTER for time series analysis and I need to research on building NDVI because when I ran them for each ASTER. Most of them it came out ...
0
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1answer
70 views

change spatial resolution

I have two types of image, one of them is a TRMM image with 0.25 degree cells and the other one is a MODIS image with 1 km spatial resolution. How can I change my TRMM image resolution to 1 km ...
0
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1answer
9 views

Question about ERDAS TOC

On occasionally when I open a raster in ERDAS 2013, I get white or yellow circle icons on my ERDAS Contents and tried to find information on ERDAS. I want to know what does the icon mean ? Thanks ...
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0answers
106 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 ...
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1answer
412 views

Formula for Enhanced Vegetation Index (EVI) in ERDAS modelbuilder?

I am trying to derive Enhanced Vegetation Index (EVI)from Landsat 5 TM data using ERDAS model builder.d I can't seem to get the output I want as it comes out blank. This is the formula I used 2.5 ...
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1answer
66 views

How to perform a standard deviation stretch on a raster in QGIS

Is there a way to perform a (2) standard deviations stretch on a raster image in QGIS 2.2? I have found the raster styles menu, but the help says there is no help in my language (English) and whilst ...
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3answers
1k views

How to convert orthophotomap to .ecw file?

I am looking for a method for convert orthophotomap (.adf files) to ERDAS .ecw file. Have you got any ideas ? Or maybe you have got any other idea how i can reduce a size of orthophotomap .adf ...
2
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1answer
864 views

Atmospheric correction for Landsat 8 in ERDAS?

I am attempting to run some classification on Landsat 8 imagery, however, I need to perform atmospheric correction on the images in order to reveal true spectral signatures. I am using ERDAS, and the ...
3
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2answers
2k views

How to create an animation from raster data?

I have some NDVI and precipitation/temperature images at the monthly time step from Jan, 2005 to Dec, 2008. I need to create animation image to show the temporal change. How can I do this. Is it ...
7
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5answers
3k views

Large mosaic process failing - what are the options? software independent only focussed on result

I need to mosaic about 550Gb of tif imagery together and the software I have tried keeps failing. The area has been split into zones so that the smallest has approx 200 tiles. I have used the latest ...
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0answers
58 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 ...
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0answers
10 views

Erdas grids names to field names in tables renamed when saved

I am trying to use zonal stat on several imagine rasters and save values to a table with several automatically added fields that will have the same name of the corresponding raster, I can do it but ...
2
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1answer
406 views

MOD 35 Cloud Mask HDF in ENVI

I am having difficulty getting ERDAS or ENVI to correctly read and display cloud mask attributes from MOD 35 HDF files. They files are displayed as 0-255, whereas I expected some kind of code 0, 1, ...
7
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1answer
242 views

How to produce a vegetation stress map utilizing the spectral blue shift of the red edge?

I am interested in mapping vegetation stress utilizing the blue shift to the red edge phenomenon in remote sensing. The figure below shows the expected change in reflectance of green leaves under ...
2
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2answers
111 views

How to copy/move Mosaic Dataset to another location?

On my previous question on Mosaic Dataset vs. ERDAS 2011 Is ERDAS 2011 or ArcGIS 10.1 best to use when mosaicking 100's of ECW image files?, I did research for a bit was wondering what happens if you ...
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0answers
103 views

Is ERDAS 2011 or ArcGIS 10.1 best to use when mosaicking 100's of ECW image files?

I have to perform hundreds of imagery files and they are in ECW files. They are 1 ft resolution and are in quarter quad and came from BLM but they are product by NGA. I wonder which software is the ...
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0answers
107 views

Uninstall ERDAS ECW/JP2 SDK Version 5.0 (Ubuntu)

I am using Ubuntu Linux as main OS when it comes to geoprocessing but I am not yet an expert using it. I recently needed QGIS to have ECW support, so I followed the instructions of Luke in the ...
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1answer
70 views

How to choose pixel values according to each land cover class?

I would like to do following steps using two types of images (precpitation and Land cover image): select pixel values of precipitation image within each land cover classes calculate total amount of ...
1
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1answer
627 views

how to do change detection in ERDAS

I'd like to ask a really simple question. I want to obtain the size of unchanged, decreased, and increased area etc (just like shown in image below) from 2 classification images in 2000 and 2007. How ...
1
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1answer
51 views

How can I change the highest and lowest value of image?

I want to change the highest and the lowest value of raster image. I want it to have the highest value of 345 and the lowest of 0. The highest value of original image now is 265 and the lowest is ...
2
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1answer
54 views

can i merge resolution with float single data type

Can I merge resolution with both image is float single data type? I have done this, but the output image become white. Do the data type must be in unsigned-8 bit for the merge to be success?
3
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3answers
307 views

Where to obtain free 15m ASTER image for New Mexico?

I am looking for a free Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) image that will let me to perform NDVI for the pilot crop health/soil moisture that can go as far back ...
10
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1answer
758 views

How to Remove Dark Bands Where Scenes Overlap in Mosaic Landsat TM5 Image?

I have an image mosaic of 5 Landsat TM5 scenes. Where the scenes overlap there is a dark band, only on the left and right sides, but the top and bottom are seamless. What is the best way to correct ...
4
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2answers
156 views

What Information Does the Blue Band Provide?

I am playing around with ERDAS and was implementing image difference on two rasters separated by interval of time. I was using a blue band raster and I created a default threshold for percentage ...
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0answers
56 views

How to request elevation data from ERDAS Apollo?

I'm developing a custom application(Desktop based using uDig SDK) where user have a provision to select the line feature on map to view its elevation chart. So far I can do this using Google ...