Questions tagged [erdas-imagine]

ERDAS IMAGINE is a remote sensing application with raster graphics editor abilities designed by ERDAS for geospatial applications.

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11
votes
5answers
10k 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 ...
11
votes
0answers
2k views

Why is GDAL ECW compression much poorer than ECW compression from ERDAS [closed]

We use ECW compressor shipped with ERDAS Imagine to export Orthoimagery for our different departments. Because we are facing problems with the Imagine license server, we had to choose GDAL (built with ...
10
votes
1answer
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 ...
9
votes
1answer
414 views

Confidence in pan-sharpened classification?

I pan-sharpened one Landsat Image on ERDAS using the resolution merge resource, with brovey transform and nearest neighbor techniques. But I was told that in terms of land-use classification, it would ...
8
votes
2answers
3k views

Remove clumps of pixels in R

I would like to remove isolated pixels (or clumps of pixels <9) from my raster image. library(raster) # create some raster data r <- raster(ncols=12, nrows=12) set.seed(0) r[] <- round(runif(...
8
votes
3answers
2k views

How to easily identify/classify coniferous forest from one date Landsat image?

I am pretty new in remote sensing and I am trying to identify/classify coniferous forest cover from single date Landsat scene. According to my preliminary web research I have these possibilities: ...
7
votes
5answers
2k 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 ...
7
votes
1answer
1k views

How can I change the class of one pixel in a classified image?

I have a classified image (I did it in ERDAS) with six categories. There are some misclassified pixels (especially high-density urban category). Is there any way that I can choose one pixel and then ...
7
votes
3answers
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.
7
votes
1answer
396 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 ...
7
votes
1answer
231 views

Options for manually identifying road defects from Terrestrial Lidar

I am trying to create a process to identify road defects manually from Lidar. We have Erdas 2013, ArcGIS10.1 and Global Mappper 14.2 as options for paid software. So far Merrick Mars displays the ...
7
votes
1answer
766 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 ...
6
votes
4answers
4k views

Seeking alternative to ERDAS Imagine? [closed]

I am having trouble with the ArcGIS 10.1 and ERDAS Imagine 9.2 license conflict. From what I found out it isn't that rare, but I do not understand why there such a conflict in the first place. ...
6
votes
1answer
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?
6
votes
1answer
715 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) ...
6
votes
2answers
2k 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 ...
6
votes
2answers
206 views

How to remove vehicles from an aerial photograph

I have an aerial photograph of an area. The image includes visible traffic signs and vehicles. How can I remove the vehicles from the image? Is it possible to do so in software like Erdas or Envi ...
6
votes
1answer
1k 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 ...
6
votes
1answer
2k views

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, ...
5
votes
1answer
5k views

Open Source Alternatives to ERDAS IMAGINE ATCOR?

I have been using ERDAS IMAGINE's ATCOR extension for ATmospheric CORrection of ASTER imagery. What opensource options exist for atmospheric correction of ASTER Level 1B products? I'm primarily ...
5
votes
3answers
1k views

Will Toshiba Satellite 70-A-11h meet GIS student notebook requirements?

I'm just about to start a college to study GIS and I need new notebook computer. I would like a one that will last me for awhile and that can run the ArcGIS and ERDAS Imagine programmes that are ...
5
votes
2answers
2k 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?
5
votes
2answers
11k 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 ...
5
votes
2answers
95 views

Knowing the pixel size for a raster before it was resampled

Is there a method to know the exact pixel size (the original size) of a raster “aerial photo”? I have purchased an Arial photo with 10 cm pixel size resolution, and I received a sample of it, but ...
5
votes
1answer
776 views

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 ...
5
votes
1answer
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 ...
5
votes
1answer
370 views

Using original Landsat multispectral image or pan-sharpened image in land cover classification?

I am currently creating land cover maps of a number of national parks across Asia from Landsat 8 imagery and also later from SPOT imagery. I plan to use supervised classifications in ERDAS IMAGINE and ...
5
votes
1answer
332 views

Remote Sensing Indices for urban expansion

Apart from NDBI, could you name a few indices for urban expansion? I have done some search on google but haven't found anything that could help me. Perhaps, What I'm interested is also: road/...
4
votes
3answers
6k 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 ...
4
votes
2answers
3k 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 ...
4
votes
2answers
592 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
votes
2answers
3k 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 ...
4
votes
0answers
526 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 ...
4
votes
0answers
872 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 ...
3
votes
5answers
6k views

Creating a Time series NDVI map

I would like to create a NDVI Time Series map? How do I do that? The one I probably would like to have similar like this http://proceedings.esri.com/library/userconf/proc02/pap0593/p05931.jpg I ...
3
votes
5answers
4k 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 ...
3
votes
3answers
2k 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 ...
3
votes
2answers
12k views

Creating NDVI from multispectral imagery?

I have LISS IV image data in three bands (band4, band3 and band2). I wanted to know the required steps to obtain the NDVI image from the given data using ERDAS IMAGINE 9.2.
3
votes
2answers
2k views

Cloud/Shadow Masking: How to shift a cloud mask in Erdas/ArcMap/Py Script

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 ...
3
votes
4answers
2k views

Some remote sensing tutorials [closed]

I could use some tutorials on remote sensing, but some books provided they are free, would be useful. To be specific, tutorials on ERDAS Imagine, ENVI and other remote sensing software, general ...
3
votes
1answer
1k 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, ...
3
votes
4answers
7k 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 ...
3
votes
2answers
8k 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 ...
3
votes
1answer
298 views

Is it possible to solve Differential Equations in ArcMap and/or ERDAS Imagine?

I would like to know if it is possible to solve differential equations and run them directly in either ArcMap or ERDAS Imagine, similar to the raster calculator in ArcMap?
3
votes
1answer
2k views

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 ...
3
votes
2answers
931 views

Reduce the resolution of satellite imagery data for use in MATLAB

When I am using the 4-band multi-spectral data for NDVI calculation, after successful completion of runtime, it shows some warning message like "Loading 17%..." How should I rectify it? Should I do ...
3
votes
3answers
1k 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 ...
3
votes
2answers
261 views

Exporting Sentinel-2A imagery from QGIS to ERDAS Imagine 2013

I have downloaded a Sentinel-2 image and loaded the 10m bands from the .xml file in QGIS which works fine. I simply want to open the image in Erdas Imagine for use in accuracy assessment in a true ...
3
votes
3answers
977 views

Unstack band layers from raster

I have stacked layer (from ERDAS) of Landsat 1-5 and 7, bands. I want each of the bands in a separate layer. How can I do that?
3
votes
1answer
2k views

supervised classification

I am having a problem in creating new signatures in Signature Editor in ERDAS 2014. Whenever I click on the icon (i.e., after selecting the aoi), it shows an error which says "unable to open ...