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

learn more… | top users | synonyms

0
votes
1answer
16 views

ArcMap's base map with imagery collection date [duplicate]

How can I determine the collection date for ArcMap's base map with imagery? I'm using ArcMap 10.3.1
2
votes
1answer
23 views

Imagery Band order for Natural and False color imagery

I have an image which has had its band ordering rearranged, giving it a weird false color. I wanted to change it back to a natural color, so I used GDAL and through trial and error got the bands ...
0
votes
0answers
27 views

Free satellite images for academic purposes [duplicate]

Since the Landsat mission opened it's archive a lot of great scientific studies have been produced in the field of Remote Sensing. The Sentinel imagery from ESA is also thought to be open access ones ...
2
votes
2answers
40 views

How to extract clear cut areas from dried trees in forests

I have 40 cm resolution aerial image with visible and near-infrared bands. Purpose is to extract dried trees in forest. I used multiresolution segmentation algorithm to extract individual trees and ...
2
votes
3answers
586 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? A short update concerning this attempt to ...
0
votes
0answers
19 views

Spatial Resolution (Scanning Precision)

I am using Landsat_7 image and details is pasted below: - Date of acquisition: January 2001 -Pixel size: 25 m -Spectral bands:  Band 1: Blue 0.45-0.52 µm  Band 2: Green 0.52-0.61 µm  Band 3: Red ...
3
votes
1answer
129 views

Is there a tutorial explaining the basics of WMS?

I'm building some software that needs to download satellite map images to display behind some survey charts. I understand that, to download these images, I need access to a Web Map Service. The only ...
0
votes
1answer
378 views

Incorrect spatial extent for imported HDF image on ArcGIS Desktop?

I imported an hdf image onto ArcGIS but I cannot make correct projection of it. Also, it does not have correct spatial extent (please see the enclosed figure, the small one is projected under WGS84). ...
0
votes
1answer
156 views

Seeking imagery for Mexico?

I am doing Rapid Watershed Assessment for my agency and I am responsible for the Southern New Mexico and northwest Texas. I have 2 NAIP added to my ArcMap already and using it with the "Add Image ...
0
votes
2answers
66 views

How to save imagery from online raster service for offline use?

QGIS allows me to connect to free map services like ESRI's 'world imagery'. I would like to save a certain part of it (decided by map extent) in the highest zoom level available in the service for ...
1
vote
1answer
112 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 ...
0
votes
0answers
29 views

How to calculate Fiducial mark?

I'm working on a photogrammetric project. For the interior orientation, i have to calculate fiducial marks a,b,c and d thanks to my input information : distance in mm between AB, BC, CD...and also ...
1
vote
1answer
58 views

georeferenced JPEG images not intalling in QGIS correctly

I am trying do add georeferenced aerial images (jpg files) to my QGIS. They do not install properly. I either get a grey rectangle or bands of colour (mostly blue) that appear where the image should ...
6
votes
6answers
7k views

How to redefine the nodata value into zero 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 ...
1
vote
0answers
16 views

Raster Imagery Performance

I'm currently building a project that will involve using raster imagery in the field on a Windows tablet with QGIS/Intramaps Roam and haven't been able to get a satisfactory understanding of a few ...
1
vote
0answers
28 views

Why the quality of image is changed as it is added to a mosaic

I have added an image to a mosaic dataset but I have noticed that the quality of the image has been changed automatically. How to keep the original quality of the image after adding it to the mosaic ...
1
vote
1answer
87 views

Looking for real-world DJI Phantom 3 Professional sample geo-tagged images for testing

I am looking for sample DJI Phantom 3 Professional imagery for testing purposes with the Drone2Map for ArcGIS Beta software. So far I am finding the application very polished and easy to use but I am ...
1
vote
3answers
39 views

What can I use to have aerial imaging delivered via slippy URL format

We have been given a license to aerial imaging from a local supplier. They are available in: * 1km x 1km tiles in MGA coordinates in both TIFF and ECW file format * Mosaiced blocks in MGA coordinates ...
0
votes
1answer
164 views

Converting satellite image into raster

I am (very) new to GIS in general. I would like to convert a satellite image of a province into raster, assigning each pixel its own data (i.e., a number and a name) based on its html color code. For ...
0
votes
1answer
36 views

Provider of hyperspectral imagery SWIR band

I'm looking for aerial hyperspectral imaging with SWIR band; size of ground pixel should not exceed 5m and dated not earlier as 2015. Could you propose provider such of data ? Area of interest is ...
1
vote
0answers
20 views

How to make LISS-III image coloured

In order to study land use and land cover change from LISS-III images I want to see the image coloured (i.e. false-colour composite RGB) using ENVI 5.0. What is the procedure?
0
votes
2answers
90 views

clip aerial map from Add Basemap Imagery

I wish to clip an aerial image from the "Imagery" of Add Basemap in Arcmap 10.3 and save as a sid file. How can I do that? Can someone help me please. Example, I am looking to clip only the state of ...
1
vote
0answers
53 views

salt marsh recession mapping with landsat/WV, IKONOS) [closed]

I am trying to detect timing and pattern of change in a particular salt marsh (low marsh sitting close to a high marsh). Basically, I'm interested in detecting changes in the leading edge for ...
4
votes
2answers
199 views

Download MODIS data for Mexico

I would like to download MODIS npp images for Mexico but I cannot figure out which files correspond to the country. How can I associate each tile to its location without looking at the million of ...
0
votes
0answers
10 views

Mosaic georef is a few pixels off for half of my image, how to georeference?

I have two sat. images from the same platform on two different dates. The images overlap each other nicely, but I cant get them to accurately mosaic into one raster image. I merged the two photos ...
1
vote
1answer
263 views

How to calculate 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 Arcatalog, statistics are calculated for every image band. ...
0
votes
0answers
14 views

How to avoid the quilt effect when displaying imagery from multiple source

In the context of creating my own imagery viewer (for educational purpose), I would like to learn about the process used to create seamless transitions between satellite imagery tiles coming from ...
7
votes
5answers
2k 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
0answers
67 views

Python script to automate saving satellite images for different combinations of lat longs

PS. : This is my first try at a GIS application. Please forgive if my question is pedantic. I would like to get a series of satellite images all at the same scale centered around different points on ...
0
votes
1answer
72 views

Where can I find SRTM DSMs (digital surface model)?

I'm interested in finding a 30 meter DSM (digital surface model that includes canopy) from SRTM with the hope of creating a 30 meter canopy height model. I know that it can be done because the ...
4
votes
0answers
99 views

Counting number of plants in area using images from UAV?

How do I count the number of pineapple plants in a 1-hectare block? I have heard of these algorithms but I don't know how to do it. I'm still a newbie of QGIS, ArcGIS and ENVI. I have the NIR, RGB, ...
1
vote
2answers
185 views

What exactly is 'anti-aliased image generation'?

What exactly is 'anti-aliased image generation'? I tried to google it, but didn't quite get it.
1
vote
1answer
62 views

How to determine the bands from an aerial image?

I received a set of aerial images taken with a Canon camera, I don´t know which kind of lens it has, or if it has been modified. After performing split image algorithm in Qgis, I get four new files: ...
3
votes
1answer
270 views

Counting animals using near infrared imagery from a drone

I am playing around with an idea of using a near infrared camera to fly transects to count animals on the ground. I have been involved in such work earlier, but on bigger mammals and observer based ...
0
votes
0answers
57 views

Digitizing scale when digitizing from Bing imagery service in QGIS

I need to digitize a bunch of islands from imagery in QGIS. It is the Bing Maps aerial imagery layer. I will obtain all required permissions. My plan is to lock the map scale at 1:25,000 and use heads ...
4
votes
2answers
170 views

Avoiding purple anomaly on imagery in ArcMap?

What is this purple anomaly on the imagery that we just received? The only thing I have done processing wise is to build the pyramids when they first came into ArcMap. Other than that, I have not ...
4
votes
0answers
77 views

How to use GDAL Correlator?

I need to align several images using FOSS. There is Correlator tool in GDAL (source) that seems to be suitable for the job. But I was unable to find documentation for it or a tutorial. Can someone ...
0
votes
1answer
56 views

Importing World Map image, color issues?

I am having a hard time finding a world relief map with "lighter" ocean colors that will actually display as such in Arc. This is the image I download from the web but this is how it displays in ...
2
votes
1answer
172 views

Geting Bing imagery to fully load in QGIS?

I'm using qgis 2.8 and by using the Open Layers plugin, I can access Bing aerial imagery. When I try to load it about half the tiles are missing. How can I get it to fully load so that my map is ...
2
votes
1answer
247 views

Trouble viewing MrSID in ArcView 3.3

I have been using 3.3 for some time and now I have Arcmap10 on the same computer. My problem is that I cannot pull up the Mr Sid files. 3.3 can't find them ,the id has the right info but no image of ...
0
votes
1answer
876 views

Where can I find GIS data about NYC's combined sewers (CSO) that's free to use?

I've located two sites that display the data that I'm looking for, but both lack exporting functions. OASIS NYC and maps.nyc/gov Otherwise I can't locate this data anywhere in a format I can use in ...
1
vote
1answer
43 views

Georeferencing DWG files on imagery which is hard to see through (e.g. trees)?

Here I have a few campgrouds that I have for are in DWG files that I am going to georeference them. I have no problem with that however; some of these campgrounds I need to georeference on the imagery ...
1
vote
1answer
50 views

Problem with low quality tif

I have the problem with low quality raster. Now it looks like this: I would like to change this to looks like this: Im using ArcGIS, ArcScan. After some work with photoshop and reclassify with ...
1
vote
1answer
188 views

Difference between spatial and geometric resolution

Wikipedia quotes Campbell 2002 as saying: Spatial resolution is defined as the pixel size of an image representing the size of the surface area (i.e. m2) being measured on the ground, determined by ...
4
votes
1answer
212 views

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).
1
vote
1answer
161 views

Adding Esri imagery to QGIS using “services.argisonline.com”

I'm trying to add this particular imagery in QGIS: http://services.arcgisonline.com/arcgis/rest/services/World_Imagery/MapServer/3 But when i write the phyton srcipt i get the message that the URL ...
3
votes
0answers
39 views

Why does my Validation Script continue to run when adding the result to the map?

I am in the process of developing a python script that creates a list available imagery for our project areas that would then allow the user to choose which imagery source they would like to add to a ...
2
votes
0answers
69 views

How to interpolate values for NaN pixels using ENVI?

I'm currently using MODIS data and am running into problems with NaN values in the final product caused by clouds. I'm interesting in a simple way to spatially interpolate (fill in) these NaN values. ...
8
votes
3answers
12k 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 ...
1
vote
3answers
900 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. The WMS (bing and esri) I have been able to ...