Imagery refers to raster based datasets acquired from sensors on satellites or aircraft.
3
votes
3answers
85 views
Pictometry Accuracy and/or Alternative
I'm looking for some insights into the accuracy (x,y,z) of oblique imagery from Pictometry in terms of providing accurate measurements for property evaluation. Is the high cost of this product ...
5
votes
3answers
721 views
Mosaicing many large ECW files for display in ArcGIS Server apps
I have about 200 ECW files of recently acquired 1-foot resolution aerial photos. Its about 15GB worth, covering over 250 sq. miles. Unfortunately, you need a license from ER Mapper that runs about ...
3
votes
2answers
73 views
Tasseled Cap Transformation Rapid Eye
I want to do tasseled cap transformation on rapid eye data. the main question would be about the parameters which are used. Somebody has a suggestion?
0
votes
0answers
23 views
Can't open ArcGrid created by Seamless viewer from NED [closed]
I have been unable to add elevation rasters generated by, and downloaded from the USGS's Seamless viewer, http://seamless.usgs.gov/website/seamless/viewer.php from the National Elevation Dataset ...
4
votes
3answers
124 views
How to crop a satellite image?
I am wondering how to or if it is possible to crop a SPOT satellite image (the image has black edges) using ArcMap 10 and if so how do you do this. I appreciate any advice.
9
votes
2answers
240 views
What countries allow commercial use of drones to collect aerial imagery?
Currently the US government forbids commercial use of drones to collect aerial imagery. The FAA is supposedly reviewing this to determine what sorts of restrictions are needed to allow this to happen ...
10
votes
6answers
826 views
What is this “brown spot” in Google maps?
I was in Google maps today and noticed near Baltimore, US where the river is, there's a huge brown spot. Is this due to all of the waste? If so, will this keep going all the way into the ocean?
6
votes
1answer
541 views
What causes these shiny artifacts in Google Maps imagery?
Do you know what causes artifacts like this one:
Source: ...
2
votes
2answers
84 views
Is there a source for leaf-off aerial imagery?
I am looking for leaf-off imagery for Oklahoma, Kansas and Texas. 1m leaf-off imagery would be ideal, although any substitute would be helpful. I need fairly high resolution imagery to distinguish ...
2
votes
3answers
166 views
Finding Satellite Imagery For Use Without Internet Connection
So, I am not a GIS expert. I just write software and I've done some work with ArcMap, ArcGIS Server, and FalconView. What I need is world wide satellite imagery I can use on a local machine. Street ...
1
vote
2answers
69 views
Which Software can derive building footprints from imagery?
I'm looking for a software solution that can process large areas of imagery to produce building footprints.
For the area of interest, I can source either satellite stereo pairs or oblique imagery. I ...
1
vote
1answer
47 views
trouble with i.landsat.toar failing to identify satellite
I am trying to use the i.landsat.toar tool on L7 bands. I have tried to use both the MTL and MTLold, but no matter what I try, it returns "Failed to identify satellite." What am I doing wrong?
0
votes
0answers
88 views
Moving files in OS street view? [closed]
I have selected all the TFW files. How do I 'move' them to the Street View SX > data > sx folder ? There is no copy and paste facility and not sure whether I need to extract them?? (Never used this ...
0
votes
0answers
36 views
How to perform Neural Network Classification?
I'm using ENVI 4.8.There are some problems on parameters for Neural Network in Envi.(Envi-Classification-Supervised-Neural net)
There are 5 bands and 12 classes that i have used for my study .
The ...
1
vote
3answers
239 views
Free Imagery WMS Feeds in QGIS
I was wondering if anyone knows of a free WMS of imagery that I could use within QGIS. The imagery does not have to be high resolution (Blue Marble even). I would like to have a base imagery feed ...
3
votes
4answers
143 views
Place image without using points in QGIS
I am trying to find a GIS software that does this, so I am trying QGIS but other suggestions are welcome.
I have a basic shp boundary such as a rectangle. I want to be able to import an unreferenced ...
3
votes
3answers
946 views
How do I set pixel values to nodata in QGIS?
I have an image which i cliped with an AOI polygon. The contour area was set to pixel value = 0 and I have a nodata value of -32768. I want to redefine the nodata value into zero. I used to do this ...
7
votes
3answers
222 views
Where can I get aerial images for commercial use?
Related question: Free aerial map images for commercial use - Alternatives to Google maps
I'm looking for a service that will allow me to download images at up to 1 meter resolution. Currently our ...
6
votes
1answer
135 views
Coordinate system in aerial imagery
I am calculating WGS84 coordinates of points in an aerial image, given the WGS84 coordinates of the center of the image and the ground distance width and height (calculated from altitude and lens ...
5
votes
2answers
192 views
Extract certain area of contours/satellite images
I have 2 satellite images (jpeg2000 format) and 2 xyz-files from the same area. I am trying to extract certain region from the area including contour lines and the satellite image in order to import ...
7
votes
2answers
109 views
How to perform enhancement operations on an satellite imagery in QGIS?
I am a new user of QGIS please suggest how to perform image enhancement operations on an satellite imagery like ratioing, contrast stretching, edge engancement, filtering etc. in QGIS?
1
vote
2answers
332 views
Where to download 4 band NAIP imagery?
I seem to recall USGS Earthexplorer providing current and historic 4 band NAIP imagery over the last few years. It appears that these data have been migrated to the National Map. However, the ...
1
vote
1answer
94 views
How to programatically replace ArcGIS Online image with new imagery in mxd's?
I have many mxds that previously used ArcGIS Online Bing imagery. I want to replace those with newly purchased imagery. I know I need to use the arcpy.mapping.MapDocument module to do this though not ...
3
votes
1answer
99 views
How to easily import aerial imagery into gvSIG?
I have used ArcView GIS 3.x for years. I have decided to try some of the free GIS desktop software. I am now trying gvSIG. One feature I was hoping for was the importation of aerial imagery relatively ...
1
vote
0answers
125 views
Raster satellite images for QGIS
When I try to apply a downloaded GIS satellite (t=rimage to Quantum, it doesn't seem to open properly. There must be a step-by step description on how this would be done effectively. Can anyone tell ...
3
votes
1answer
96 views
gdal_warp of multiple rasters keeping maxium intensity value
I have multiple rasters which overlap eachother geospatially but do not completely occupy the same space. I can combine them with gdalwarp like:
gdalwarp -s_srs EPSG:4326 *.tif larger_output.tif
...
7
votes
4answers
289 views
Visualization of satellite image - directly in python
Is there any way (a package or what not), to visualize a geotiff image directly in Python? I don't want to use ENVI or ArcGIS or anything else. Thank you in advance.
3
votes
1answer
23 views
How to know the required scene required to cover an area?
I want to know how to find the nos. of scene of LISS 4 data required to cover an area(say 84000 sq km)? any suggestion/solution/calculation?
3
votes
2answers
62 views
How many stereo satellite imagery required to prepare DEM of an area?
I want to know how to find the nos. of scene of stereo CARTISAT-1 data required to prepare DEM of an area(say 84000 sq km)? any suggestion/solution/calculation?
7
votes
4answers
466 views
Where can I download free satellite imagery of Cambodia for offline use?
I am an entry level GIS user - I have had one semester of GIS in college.
I have successfully downloaded raster satellite imagery from Seamless (tiff files) for my class project.
Now I am trying to ...
11
votes
2answers
348 views
How to equalise colour, brightness and contrast across several scanned paper maps
I am a vectors guy mostly, but for a current project I need to work with a bunch of old scanned paper maps (ww2 bomb damage maps for London, if your interested!)
We scanned and georeferenced the ...
0
votes
0answers
55 views
Why does publishing a Map Service from MXD turn Imagery Grey
When creating a map service from an MXD I'm running into an issue where my imagery is turning completely grey.
I start with an MXD which has my mosaicked image and I publish it to a map service (no ...
2
votes
0answers
128 views
Automated testing for GIS apps
There are several commercial and opensource tools for regression automation. While many of them could be employed to test GIS apps, they fall short, at times, dealing with the unique characteristics ...
2
votes
2answers
153 views
How to identify image footprints of an aerial photograph
I need a tool that will take aerial images with Lat, Long, and Alt in their EXIF data and produce foot prints of the images. We need to verify that the images cover the photographed area with proper ...
1
vote
1answer
126 views
Is there a way of viewing a photo has a point tag from Photo2shape in QGIS?
Is there a way to view images (photos) that have location point from Photo2shape by clicking on the point in QGIS?
1
vote
1answer
72 views
Is there an image service from GOES available for ArcGIS?
I have an arcmap project using an arcims service from NOAA ENC (http://ocs-spatial.ncd.noaa.gov) but maybe the service is unavailable right now and I can't access to imagery...
Is there an image ...
12
votes
3answers
360 views
Alternative vegetation indices
I have been using NDVIs with limited success to identify trees in the central Great Plains region of the USA. The problem I have been encountering is that reflectance from farm fields/pastures have ...
2
votes
1answer
343 views
Convert 3-band raster imagery to distinct vector zones in ArcGIS
So much like the title says I would like to convert a 3-band infrared image TIF file of vegetation into distinct vector feature zones using ArcGIS. I'm guessing the only way to do this is with ...
5
votes
2answers
509 views
Creating a multispectral image from scratch
I want to make a multispectral image from cero to do some tests on it. Something really simple like 5 completely uniform bands with salt and pepper noise on them or a square of different values at the ...
0
votes
0answers
85 views
Change Detection on bitemporal multispectral images - data simulation
I want to try several "backgrounds" for change detection on bitemporal images (satellite images of the same place but in different moments in time). Images consist of 5 bands. I have python ...
4
votes
2answers
141 views
Wavelet vs Discrete compression for imagery
What is the main reasons to choose wavelet (jp2, sid, ecw) instead of discrete (JPEG) compression methods for raster data?
Lets limit this question to aerial imagery and lossy compression.
Why ...
3
votes
2answers
225 views
Purpose of building footprints
What are the uses (public and private industry) of building footprints?
I'm trying to figure out how polygon building footprints can be used. i.e. are they used for determining tax liabilities, ...
2
votes
3answers
356 views
Looking for high resolution (1m or better) aerials for Turkey
Would prefer free but under a couple hundred dollars is also doable.
It would be nice to have actual tif, sid, etc. files but a WMS would also work... using ArcGIS 10
Would also consider any of the ...
2
votes
0answers
72 views
Are there any naming conventions for aerial imagery?
Do GIS projects involving high resolution NAIP quarter quad imagery typically use the USGSID code and qq (e.g. 3910232ne) or the GNIS code and qq (e.g. 39102e1ne) to organize data? I can't seem to ...
19
votes
7answers
1k views
Work flow for georeferencing imagery using open source tools?
Does anyone have a recommendation for a work flow for georeferencing high resolution aerial photography using open source tools? Comparison of user friendliness and robustness between Quantum GIS ...
5
votes
5answers
544 views
georeferencing aerial photos with only known centroid
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 an ...
2
votes
3answers
299 views
Combine aerial imagery pictures to create a layer
We are looking for software or a web service that we can put in pictures we took using our weather balloon to create a single image, that we can use as a layer for our GIS project. Preferably free, or ...
11
votes
4answers
375 views
When should I be calling a 'rectangular grid of pixels' a raster or an image?
Reading through GIS literature, it sometimes feels that authors use the two terms with a specific meaning in mind. I always treat the terms interchangeably. Am I wrong?
Read the first line in the ...
2
votes
2answers
2k views
Where can i download a good World image in GeoTIFF?
I can either be from MERIS (ESA) or from MODIS (Nasa). I already reached these sites:
http://www.unearthedoutdoors.net/global_data/true_marble/download
...
2
votes
2answers
108 views
What exactly is 'anti-aliased image generation'?
I tried to google it, but didn't quite get it. Any help and/or examples?
Thank you!
