All Questions
545 questions
1
vote
0
answers
249
views
How do you convert an Imagine raster attribute value into the raster value?
I have a raster derived from image segments with row id as the value. I have an attribute in the attribute table which should be the raster value, "Standard deviation layer 5" (see image). How do I ...
- 151
4
votes
1
answer
6k
views
How to read/write ENVI metadata using GDAL?
I am trying to use GDAL to read and write images in ENVI format (for example a .bsq file with an associated .hdr file). The GDAL Formats Info page states "Starting with GDAL 1.10, all ENVI header ...
- 4,014
-3
votes
1
answer
985
views
How to calculate cumulative mean in ArcGIS, ERDAS and ENVI? [closed]
I'd like to get cumulative mean value from a multiband image (4 bands).
How can I do it in ArcGIS, ERDAS and ENVI?
- 659
5
votes
2
answers
420
views
ENVI to map composition
I'd like to print out 6 images in a single page. How can I do this using map composition tools in ENVI (6 images are year-to-year dynamic images with the same size and the same geo-referencing)?
- 579
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
3
votes
1
answer
2k
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, ...
- 91
10
votes
1
answer
2k
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 ...
- 101
1
vote
2
answers
5k
views
How to determine soil moisture index values from reflectance values in a satellite image?
I'm working on determination of soil moisture by remote sensing. I would like to know how we can determine soil moisture index values from reflectance values in LANDSAT TM images.
- 89
6
votes
1
answer
2k
views
How to convert an Erdas training set to .csv?
I am working with Erdas Imagine's Signature Editor to perform maximum likelihood classification. I need to use the same training set created in Erdas for other classification using R. Is there a way ...
- 51.8k
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
7
votes
3
answers
4k
views
Calculating area of vegetation in raster file?
How do I calculate area of several vegetation types in a raster (.img file type) image. They are color coded. Am using QGIS (1.8.0) and ERDAS 9.2.
- 79
3
votes
2
answers
2k
views
ENVI BIL file algorithm logic
I have a 6 band Landsat image, RGB and 3 NIF bands. As far as the Band Interleaved by Line (BIL) method goes, the resulting image should have, and I quote ENVI manual:
the first line of the first ...
- 8,718
4
votes
2
answers
1k
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 ...
- 4,415
0
votes
1
answer
489
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 ...
- 5,157
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
6
votes
1
answer
1k
views
How to remove clouds in High resolution Imagery(.5 mGeoeye)
I have imagery with high resolution .5m, large parts covered with clouds, so it's obscure many urban areas.
How can I remove the clouds?
- 1,123
9
votes
2
answers
17k
views
How to repair topology of a shapefile?
I performed an object-based image analysis using ENVI EX, and each of the classified features were exported as a shapefile. I transferred those shapefiles into ArcMap 10, and tried to intersect them ...
- 981
6
votes
1
answer
1k
views
Floor height creation from Aerial Lidar/Imagery only
I was wondering if it is possible to generate the floor heights of buildings from aerial lidar? We don't have terrestrial lidar or stereo imagery. I don't need the ground DEM level or the roof (DSM) ...
- 8,298
1
vote
1
answer
4k
views
ENVI Vegetation Index Calculator
I am attempting to input 4-band CIR imagery into ENVI's Vegetation Index Calculator and keep running into the same error: "Wavelengths must be defined to calculate vegetation indices".
I have ...
- 51.8k
0
votes
1
answer
1k
views
"Display Background value "0" raster"
While publish raster layer in geoserver it shows background as black. How to remove the black color. if there is any options to permanently remove the black color.
- 125
1
vote
2
answers
2k
views
how to remove the color formed on the edge of satellite image?
my AOI requires two scene of satellite image but when I try to mosaic the images using ERDAS imagine, the color of the edge is seen forming black line after mosaic! so please how can I remove the ...
1
vote
1
answer
2k
views
Removing pixel values below -1 using ENVI?
I have downloaded NDVI from MODIS website and pixel values go up to -3000 to 1. I want to remove all values below -1. How do I do this?
I am using ENVI 4.3
- 1,188
2
votes
1
answer
204
views
Error while trying to upload a .bsq file to the geoserver
I am trying to upload a .bsq file (ENVIHdr Coverage Format) to the geoserver. While doing this I got an error message. I am using the "GDAL" Extension for the geoserver. The error message is: "Could ...
- 31
1
vote
1
answer
507
views
ERDAS Imagine batch wizard edit replacement pattern help
I'm using ERDAS Imagine to batch produce NDVIs from NAIP imagery. I need to also replace the default file name (e.g. "m_3610132_nw_14_1_20100503") with a user friendly file name (e.g. 3610132nw). ...
- 21
8
votes
1
answer
331
views
Phenological event extraction in IDL
I’m doing phenological study using a threshold method in IDL. I have a twelve-band image in 2005 (format is in .tiff not ENVI format). Twelve-band means that monthly images (Jan to Dec) have been ...
- 81
10
votes
5
answers
12k
views
How to workaround large mosaic process which is failing?
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 ...
- 8,298
3
votes
2
answers
2k
views
Reading MODIS L1B into ENVI
I am working with MODIS Terra (and simultaneous ASTER) Level 1B swath data using ENVI and am having one of these "this should be easy" questions about the most direct way to get to geo-referenced ...
- 1,246
1
vote
2
answers
1k
views
How to import a multiband image into IDL?
I want to run mathematical calculation on monthly NDVI images from april to october. I stacked monthly NDVI images through april to october into an image (with 7 band) using ENVI. Now I wanna import ...
- 111
4
votes
3
answers
2k
views
How to add a raster legend with min/max values in QGIS 1.6?
I calculated/made NDVI with landsat data using ERDAS. Results of NDVI is in black and white map but I need it in colour to present the scale for NDVI with value of pixels in Map Composition. How to ...
- 299
2
votes
1
answer
338
views
ERDAS 2011 and OpenOffice
Is it possible to connect ERDAS 2011 with tools of OpenOffice instead of Office tools? I need to send a map composition made in ERDAS to Presentation of OpenOffice. I don't have Word or Power Point ...
- 299
30
votes
5
answers
8k
views
OpenSource Remote Sensing Tools for Classifying Roofs
with envi image processing and classification tools, you can get roofs from images with some spectral value and then you can convert it some vector data for your app.
in python with OpenCV which have ...
- 22.6k
5
votes
2
answers
12k
views
Replacing Raster Values in Ras1 with Ras2
I have two rasters Ras1 and Ras2.
I want to change the Ras1.
In Ras1, there are few areas, lines, points I am interested having nodata cells and wrong data cells.(limited to interested areas only ...
- 812
5
votes
1
answer
1k
views
Setting "REAL" work/scratch workspace in ESRI/ERDAS etc
I thought the issue was only in ARCGIS but it seems that ERDAS does the same thing. I have my C with 1.7TB and my D with 10TB and my scratch set to d:\scratch but still ERDAS (and ESRI) fills my ...
- 8,298
0
votes
1
answer
967
views
How to change the image size (column and row number) into the same size
I’m using IDL program. But I have a question how to convert different row and column number (row/col) to the same size of column and row number of 36 time series NDVI images. These images grouped into ...
- 1
7
votes
5
answers
3k
views
Georeferencing aerial photos when only centroid is known using ArcGIS for Desktop or ERDAS Imagine?
I have heaps of aerial photos that need to be georeferenced.
I have access to ArcMap and ERDAS.
All I am given is an excel sheet with the centroid coordinates of each image.
Each photo covers ...
- 133
0
votes
1
answer
561
views
NDVI image value
In order to get monthly NDVI image with max value from two 16 day-images, I used mosaick tool in ERDAS8.7 by choosing max function from "set overlap function" tool. But after doing this, when I see ...
- 169
3
votes
3
answers
3k
views
NDVI image value changes from -1 to 1 in ENVI to 0-255 in ArcGIS Desktop and ERDAS Imagine?
When i open NDVI image in ENVI, its value is still within the range (-1 to 1).
But when I open this NDVI image in ERDAS and ArcGIS Desktop, its value is 0-255.
What does it mean?
Is the NDVI ...
- 31
3
votes
5
answers
5k
views
Batch process to get single band image from stacked image using ArcGIS, ERDAS or ENVI?
Can you help me to extract a single band image from stacked multiband image. Totally, 260 image has been stacked. When I do to this, it will take a long time. So I'd like to know there is any batch ...
- 169
4
votes
3
answers
8k
views
How to create 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 ...
- 579
1
vote
3
answers
877
views
Extraction of monthly image from two-16 day images?
I need to combine two-16 day NDVI image into monthly NDVI image.
To do this, what kind of function and formula are used in ENVI, ArcGIS Desktop or ERDAS?
- 579
4
votes
2
answers
4k
views
Calculating Net Primary Production (NPP)?
When I calculate Net primary production (NPP) for a local scale, what kind of software should I use?
I always use ENVI, ERDAS IMAGINE, ArcGIS for Desktop and IDRISI.
Is it possible to use these ...
- 579
2
votes
1
answer
723
views
Importing ERDAS-processed GTOP030 dem data into ArcGIS Desktop?
I have two GTOP030 DEM images. After downloading them, I have imported into ERDAS and mosaiced them. Then I have exported it to .tif file in order to open it in ARCGIS. But when I tried to open it in ...
- 579
7
votes
2
answers
3k
views
Creating shapefile of satellite image footprints?
I'm looking for a tool or a workflow to compute satellite image footprints, for a large number of images across directories, and produce a shapefile. Ideal work flow would be:
fire up tool
point to a ...
- 1,543
5
votes
3
answers
900
views
ENVI EX reviews?
Does anyone have a review of ENVI EX? I am wondering how well the Feature Extraction and Image Classification workflows function.
- 339
2
votes
1
answer
192
views
crust index in Erdas Imagine
hey people, i have the trouble with CI index in Erdas, when i am useing the image from landsat 5 tm with atmospheric correction it gives me the whole white picture in the results,
the formula CI=1-((...
- 21