Questions tagged [imagery]

Imagery refers to raster based datasets acquired from sensors on satellites or aircraft.

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gdal2tiles georeferenced image as overlay not working

I'm using gdal2tiles-leaflet to create tiles for my Leaflet application. The images I use are GeoTiff's with the embedded projection WGS84, they are in flight photos taken by a drone. So I tried ...
Simtrax's user avatar
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How to use google maps engine connector?

I am trying to use google imagery in QGIS through the Google maps engine connector plugin. I relatively new to QGIS and need some help. What I want to do i use the google maps in QGIS and then print ...
dave's user avatar
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How to create grid from 2 separate images of latitude and longitude

I have two separate images of latitude and longitude, and want to create a grid from them so I can assign it to my Non-Geo referenced file... How can I create it, particularly in Matlab... But other ...
Ahsan's user avatar
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5 votes
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Why does the peak of a mountain appear bright on Radar images?

Why does the top of a mountain appear bright on a SAR (radar) image. I know that the peak of a mountain is subject to a layover effect, thus appearing closer on the radar image than the bottom part of ...
Hakim's user avatar
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Saving a TIFF file with band names

Does anyone know if it's possible to add a TIFFTAG when saving a TIFF file (I'm using the C/libtiff interface) that will give a name to each band? Some kind of per-band TIFFTAG_IMAGEDESCRIPTION is ...
os1's user avatar
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Aligning hundreds of rasters quickly? [closed]

I'm hoping to accurately align hundreds of aerial images that are slightly off-kilter. The images cover the same area on different dates (several acres). They contain identifiable features around ...
jm90's user avatar
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Doing supervised classification on google maps image to show only hedgerows? [closed]

I would like to then use the hedgerows by bringing it into QGIS as a layer. I need to know what software to use and the method to make such a layer? I would like to use a google earth image in Grass ...
Abigail's user avatar
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How do I convince gdal2tiles to output pngs with transparency?

I have a tiff that was created with Pix4dmapper. This tiff has coordinates embedded (as seen in the logs below) (I think that makes it a geotiff?) as well as a tfw file associated with it. Opening ...
RobotCaleb's user avatar
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QGIS: raster image georeference and overlay

I've created a grid and points in QGIS which I used to survey. Using a test image at the moment and I'm trying to fit this image as an overlay within a boundary. When I insert the image it has a white ...
Peter B's user avatar
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Calculating raster statistics for each band in QGIS?

i need to calculate raster statistics for RGBN (4 channels, multiband image) rasters in QGIS. In Arcgis if you use "calculate statistics" in ArcCatalog, statistics are calculated for every image ...
Harris P.'s user avatar
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I am looking for Thermal IR Photography with 1 m resolution?

I am looking for thermal IR photography with 1m resolution? It needs to be recent or maybe a company in western Canada that can fly a mission like this. Satellite or flown photos both work, I am just ...
jtgis's user avatar
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Using remote sensing satellite for chlorophyll mapping?

Location of my research are reservoirs which have an area of 47 and 62 km2. I need a better image resolution than Landsat(Pan).
Yax's user avatar
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Good GPS navigation app for iPhone with downloadable OFFLINE maps?

I am looking for a good GPS navigation app for my iPhone that will work away from wifi and cell coverage (GPS only) and thus allow me to download offline maps. Paid app is OK. Must Have features: ...
Jakub Sisak GeoGraphics's user avatar
1 vote
1 answer
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Satellite Images for the Mediterranean Sea Oil Spill

I am looking to obtain free satellite images to detect oil spills in the Mediterranean sea. What sensors would be most appropriate for this task and where can I download this type of data?
Abdualdim's user avatar
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3 answers
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Saving extent of satellite imagery in ArcGIS Desktop?

I'm using 50cm imagery for the whole country of South Africa, which make zooming and panning painfully slow. Can I save imagery for just the area I am working with (ie. data frame, city, province)? I'...
DrewGill's user avatar
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Free download NDVI images or raw satellite images for Sri Lanka?

Could anyone provide a site to download NDVI images or raw satellite images of Sri Lanka (Asia) for free for me to calculate the NDVI.
Lahiru's user avatar
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How do I use Multispec for Landsat data?

It seems that I only can use the Clustering if I want to cluster only one band data.. If I open up more than 1 band (in one image), the cluster toolbar is disabled? optional: Is there any free ...
AAA's user avatar
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Where to download 4-band NAIP imagery for California?

I've been trying to find orthoimages with 4 bands for a couple of counties in California. I managed to download some from the GeoSpatial Data Gateway from the USDA (NRCS), but they all only have 3 ...
user36952's user avatar
1 vote
2 answers
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Using ESRI World Imagery (for Export)?

I would like to download some of the ESRI World Imagery using this however when I try to add the layer to an online map I get "The layer, World Imagery (for Export), cannot be added to the map". I've ...
Eamon's user avatar
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2 answers
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Georeferencing in R Based on the Four Corners

I have a raster image (photograph) that was taken from a helicopter. Along with that raster image, the system also tells me the positions of the four corners of the image in a different file. I have ...
Justace Clutter's user avatar
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Satellite imagery alternatives for land use/cover classifcation

Apart from Landsat imagery, which other satellite imagery is good for land use / cover studies and can be obtained free of charge?
Ama's user avatar
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ArcGIS Server Image Service from Mosaic Layer

I have successfully created an image service from a mosaic dataset using NAIP imagery. I would like to create another image service that displays the same area in NIR (4,3,2). I have created a mosaic ...
Michael B's user avatar
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Stacking Band ratio on Landsat 8?

I have a question about Landsat 8 I am going to work on... I am thinking about stacking all the bands however there are 15 m, 30m, and 100m Do you stack all together ? This is to give the end-user ...
PROBERT's user avatar
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Limiting imagery displayed to non-rectangular area using ArcGIS Desktop?

I have a layer that shows some imagery in Ontario. I would like to get rid of the imagery that I don't need, because I only need it to be in 6 "squares" that I have. Is there a way to restrict the ...
EmilyF's user avatar
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How to serve an image layer with tilestache

I have some .png images with associated .wld and .tfw files. I'd like to display this in OpenLayers, and I already have a Tilestache server running, so it would be good to leverage this. OpenLayers ...
Alex's user avatar
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0 answers
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Why did my footprints build failed? [closed]

As I am trying to add raster to my mosaic dataset and were able to see them and now all of my raster are not showing. Why did it could not build a footprints ? I have tried everthing to get them ...
PROBERT's user avatar
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1 vote
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Mosaic dataset gives me some blocks

I am trying to mosaic NAIP into mosaic dataset and ended up like this with the block. How do I remove the blocks ? Does anybody have a suggest for me to fix them ? I am using ArcGIS 10.1 SP 3 and ...
PROBERT's user avatar
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Night - lights for social welfare

I want to to find the social welfare and the population density for Europe and Africa with night-lights. Is there any site where I can find images with good resolution (I only think VIIRS)??? I have ...
geo_dd's user avatar
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1 answer
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Satellite data between 1975-1985 in Brazil?

So I've been looking for satellite imagery to use for a project without any luck. I need images between 1975 and 1985 near the Roosevelt river in Brazil, from any satellite at any spatial/spectral ...
jfo's user avatar
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Image classification from "Imagery" basemap ArcGIS 10.2

I'm trying to reclassify the coast of France and Spain into rocky or sandy categories. So far, I've been drawing polygons around the different patches, but want to try using image classification to ...
rockyecologist's user avatar
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Where to download rasters for QGIS 2.6

Where can I download sat imagery. I've read that OpenLayers provide such things but it requires an internet connexion, and I mostly use QGIS with an offline computer. So do you know a way/provider (...
Obi Wan's user avatar
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2 votes
1 answer
23k views

Inserting JPEG or similar into ArcGIS map?

I am trying to upload an image (jpeg or similar) into a map. It can be on the layout view or data view. I am using ArcMap 10.1.
Matt's user avatar
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1 vote
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MODIS product MCD43A3 stating 16 periodicity but when downloadad I have files every 8 days

I'm downloading the MODIS derived Albedo 16-Day L3 Global 500 m resolution product. I expected to have a dataset for dates every 16 days. Instead I have datasets every 8 days as can be seen in the ...
JEquihua's user avatar
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4 votes
2 answers
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Satellites to retrieve UV bands

I want to retrieve some satellite images with UV bands, but I don't know which satellites are providing UV bands and whether we can freely download them. I have already downloaded Modis and Landsat ...
Majid Hojati's user avatar
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2 answers
214 views

How to load two images in ENVI 5.1?

I am using ENVI 5.1 and when I use the Data Manager to load several images and if I want to load two adjacent images, why would one of them load and the other doesn't?. Am I missing something here ?
PROBERT's user avatar
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2 votes
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How to create NDVI map From LiDAR intensity and RGB image

I am new with GIS and I've been looking for ways on how I could create a NDVI map from LiDAR intensity and RGB image. Is there any way I could do this? I have read that you could create an intensity ...
user84275's user avatar
1 vote
1 answer
226 views

Avoiding Esri basemap (Bing imagery) to update?

In my ongoing research, I intend to map transformations. That implies that, based on the ESRI basemap from Bing imagery, I draw certain features (in different layers) as they are today and as they are ...
Alex's user avatar
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4 votes
1 answer
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Creating a mosaic with gdalwarp - How to deal with no data and overlap

I want to create a mosaic of satellite imagery in .tiff format. I want to create an actual mosaic, not a vrt, because afterwards I will cut the image in to tiles that make sense for my users. Gdal ...
Gin's user avatar
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1 answer
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Obtaining free satellite imagery for Australian floods?

How can I obtain free satellite imagery for Australia? I want to find the extend of flood in specific time. I have already tried land-sat.But unfortunately there is no data available for that specific ...
Mike's user avatar
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1 vote
1 answer
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Publishing mosiac datasets for ArcReader?

Has anyone had luck with publishing their own imagery into ArcReader 10.2 in a mosaic dataset? I have had success publishing the my own imagery in tiles but not in a mosaic form. Does anyone have ...
Kevin's user avatar
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1 vote
0 answers
531 views

Hyperspectral Data in ArcGIS Desktop [closed]

The public organization I work for has some archived hyperspectral data (.raw - radiance, non georectified). Has anyone processed hyperspectral data for consumption within ArcMap? If so, what sort of ...
Jesse's user avatar
  • 99
1 vote
2 answers
261 views

Stereoscopy Software [closed]

I'm learning the Manual Photogrammetry process, Stereoscopy, to Process UAV Imagery. I'd like to know about others software, especially open source or low cost. ERDAS Imagine, Erdas Extensions for ...
2 votes
1 answer
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Are there free maps available that can show me land planted with oil palm?

Currently I am taking gps coordinates of oil palm plantations in Africa. I'm putting the waypoints in a GIS program but the free basemap provided isn't always giving high resolution images, making it ...
Tim De Boeck's user avatar
4 votes
1 answer
376 views

how can i save a satellite raster image as a layer file in arcmap 10.2

I am trying to save a raster satellite image from esri world imagery as a georeferenced layer file. i still want to be able to zoom in and out as i can when veiwing it through the server.
paul swift's user avatar
5 votes
3 answers
4k views

Is it possible to determine Collection Date of ESRI World Imagery Basemap

It seems like it was possible to do this with Google Imagery if I recall but is there any way to determine the date of collection of Esri's World Imagery basemap (or other basemaps) at a given ...
jbchurchill's user avatar
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1 vote
1 answer
406 views

How to output the number of channels in a .JP2

I am looking for any tool (or python code snippet) that can loop through a file folder of .jp2 images and determine which have 3 bands and which have 4 bands. I am having trouble creating a raster ...
MDHald's user avatar
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6 votes
3 answers
89 views

Residential tree cover for surveying?

Can someone point me in the direction of some high spatial resolution and reasonably recent satellite imagery for central Canada (Manitoba)? I am trying to determine whether I can generate accurate ...
Christography's user avatar
20 votes
1 answer
36k views

Panchromatic Image association with high spatial resolution

How and Why is a Panchromatic Satellite Image associated with high spatial resolution? I googled and found that it is a single band image, but then why is it called pan-chromatic(All Colors). Does it ...
Abhishek Potnis's user avatar
1 vote
1 answer
230 views

USA Historical Satellite Imagery for an Online Application

I am looking for different options to add historical satellite imagery to our online-based application. We currently incorporate Bing Maps into our application, but cannot get historical imagery. I ...
ajbrachman88's user avatar
0 votes
1 answer
134 views

Seeking Easy Guide to ESA satellite data? [closed]

Can anybody provide user friendly guidance to ESA datasets? What is available? When will new stuff be available? I struggle to work out what might be interesting amongst the many websites and ...
washways's user avatar
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