Questions tagged [imagery]

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

Filter by
Sorted by
Tagged with
6
votes
1answer
295 views

How to know which satellite took the image?

I am having trouble finding which satellite took the images I have. Most are from digital globe. I read through the metadata and the .imd file. I found date and time but not the name of the ...
13
votes
1answer
12k views

Scale 16 bit to 8 bit within range using GDAL

I am looking to scale a 16bit unsigned tiff image to an 8bit image using GDAL (OSGeo4W). However I want to constrain the pixel values so that they stay within the range of the 8bit imagery. What I ...
1
vote
0answers
167 views

Why does QGIS convert 'NoData' values to 'Zero'?

I'm trying to convert a clipped multi-spectral sentinel-2 image in QGIS to an 8-bit rendered image in a different CRS. I've clipped the image to the coastline and defined the other unwanted areas of ...
0
votes
1answer
206 views

Classification validation: Trouble with the Confusion Matrix

I'm supposed to validate my supervised classification with a Confusion Matrix, but I'm having a hard time getting what I should use as a comparison. At first, I used the same ROIs I created for ...
3
votes
1answer
137 views

Cracks between ortho images when floating on 3D surface - ArcScene

I am trying to create a seamless 3D visualisation in ArcScene 10.1. I have a TIN surface created from 1m contour lines. I have 4 tiles of ortho imagery I would like to drape over the surface. So far I ...
3
votes
0answers
211 views

Blending edges of tile overlay

I am working on a web map using Leaflet and am using purchased satellite imagery as the base map. We want to limit the extent of the high resolution image to the area of interest, so I have resampled ...
2
votes
2answers
259 views

How to create cached service from 2TB of .TIFFs to ArcGIS Server without buying Imagery Extension?

I work for a local government enterprise GIS team in California. We are an ESRI shop and were able to piggy back on our county's grant-funded aerial imagery purchase this year. We didn't have to go ...
3
votes
1answer
462 views

Information on WKT definition file

In a well known text definition file of a geolocated image (or whatever else it does) we find this: PROJCS["UTM_Zone_19_Northern_Hemisphere",GEOGCS["GCS_WGS_1984",DATUM["D_WGS84",SPHEROID["WGS84",...
3
votes
1answer
1k views

Seeking alternative site to GLC30/globeland30? [closed]

In 2014, China released a global land-cover data at 30m resolution, called GLC30 or globeland30. I used it with success in some areas. But for some months now when I try to access the main download ...
3
votes
1answer
1k views

How to calculate minimum cell value for a multi band raster?

I'm a python-qgis beginner. I use to work with multi-band rasters. Each raster is made of images coming from satellite sensors acquired in different dates and stacked in order to build a multi ...
1
vote
1answer
194 views

Open satellite imagery

Our company tracks multifamily development and is relying on opensource satellite imagery to track physical changes at development sites over time. Are there any open source providers (aside from ...
1
vote
0answers
279 views

Pixel sizes, cartographic scales and maps

In spite of being a widely discussed topic, I have not been able to find the complete answer to my concerns regarding scale's use in maps preparation. I am interested in finding in the relationship(s) ...
2
votes
1answer
480 views

QGIS aerial imagery display issue

I've encountered two issues when trying to display some aerial imagery data in QGIS and haven't managed to work out what the problem is. Frustratingly the issues only affect some tiles, and there ...
1
vote
1answer
201 views

How to select a fixed dimension ROI in ENVI?

ENVI provides the freedom to select ROIs by drawing polygons etc. I want to clip a fixed size ROI, say 512 x 512 in size. Is there a way to do that?
2
votes
0answers
34 views

Comparison of % change in two photos with GRASS

I have two aerial photos of the same location taken at two different dates. Is there a way to compare the % difference between those two images using GRASS or is there a better tool? Sorry, also if ...
2
votes
1answer
478 views

Exporting Imagery in ArcGIS - problems with lines on exported image?

I am using the pan-sharpened Landsat imagery that is available on ArcGIS Desktop (ie data from ArcGIS Online). When I export a map with the pan-sharpened Landsat imagery in the background, lines ...
1
vote
2answers
4k views

Making Leaflet image overlay draggable? [closed]

I simply want to make a georeferenced imageOverlay draggable in leaflet. I found several unanswered posts (e.g. here and here). Since it is easy to make markers draggable, someone tried to adapt the ...
1
vote
1answer
53 views

Adding NASA WELD Imagery to ArcMap?

How I would add WELD satellite imagery from NASA into ArcMap? I'd like to take the entire CONUS scan and place it into ArcMap. I tested a smaller scan of the Northeast, however I got a plethora of ...
3
votes
1answer
1k views

Publicly accessible (near) real-time satellite imagery

The operators of the Himawari-8 weather satellite provide a fresh full-disc picture of Earth every 10 minutes. This is a great resource and powers applications such as RealEarth. Are there any other ...
1
vote
0answers
186 views

Options for Bulk Download of Satellite Imagery

I am looking for some sources of Satellite imagery that I can bulk-download for offline use with mobile apps. I am willing to pay, but so far I am not finding any good solutions out there. Something ...
2
votes
1answer
76 views

Aerial picture - how can I extract water drainages on a crop (to vectorize them)

I have a RGB aerial picture of an agricultural crop. The drainages (hundreds of them) can be barely seen because they a very slightly greener then the surrounding crop area (picture is from April). ...
3
votes
1answer
1k views

Building georeferenced GeoTIFF from mbtiles automatically?

I want a georeferenced raster.In that way I don't have to georeference this raster manually . I know that geotiff has the georeference inside it , I got the mbtiles of the map how do I build the ...
0
votes
1answer
83 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
694 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 re-...
2
votes
2answers
127 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
0answers
4k views

Google Earth Extension to export georeferenced image?

Has somebody coded an extension to Google Earth that will export a georeferenced image from google earth? Google Earth and Google Earth Pro only export the image *.jpg *.png etc and don't export the ...
0
votes
4answers
3k 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
0answers
89 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
48 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 ...
3
votes
2answers
590 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
153 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 ...
1
vote
0answers
71 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
958 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 ...
5
votes
2answers
313 views

Identifying individual pine trees without using LiDAR data?

Are there any ways to identify individual pine trees without the use of LiDAR data? Crown identification seems irrelevant. My goal is to do a rough treetop calculation to get an idea of how many ...
1
vote
0answers
80 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 ...
-1
votes
2answers
102 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 ...
3
votes
0answers
436 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
2k 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 ...
1
vote
1answer
2k 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: ...
10
votes
1answer
1k views

Counting number of plants in area using images from UAV? [closed]

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, ...
2
votes
1answer
1k views

Getting Bing imagery to fully load in QGIS?

I'm using QGIS 2.8 and by using the OpenLayers 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 ...
1
vote
1answer
97 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
109 views

Problem with low quality tiff

I have the problem with low quality raster. Now it looks like this: a busy cat http://iv.pl/images/53039057684486451032.png I would like to change this to looks like this: a busy cat http://iv.pl/...
3
votes
1answer
6k 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 ...
2
votes
1answer
1k 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 ...
2
votes
0answers
66 views

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

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
588 views

Interpolating 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. ...
5
votes
0answers
446 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 ...
1
vote
1answer
422 views

Importing World Map image changes color in ArcMap?

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 ...
0
votes
0answers
80 views

Georeferencing two images at same time in QGIS?

Has anyone ever tried to georeference two images at the same time on QGIS? In my application I don't atually care much about the positioning itself, but in the scale and orientation. I have ...

1 2 3
4
5
9