Questions tagged [imagery]

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

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39 views

Boundary detection in QGIS at multiple sites [closed]

I have a list of about 70 lat/longs of various fields across an entire country. I would like to change those single points into polygons of the field boundaries using boundary detection in QGIS, but ...
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12 views

Downloading imagery in QGIS from buffered point data

I have about 70 data points spread across a country. I would like to buffer these points with a diameter of a couple of km and then download satellite imagery for these polygons. What is the best way ...
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1answer
63 views

Creating pseudo-heatmap based on time spent in AOI using ArcGIS Desktop

I wanted to see if there was a way to create a heatmap based on time spent in a certain AOI. What I mean by this is a layer you can toggle on/off that would go from clear to red as you spend more ...
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How to export Sentinel-2 Images with only three specific bands in GEE? [closed]

I need to export only three bands of Sentinel Imagery instead of the whole 13 Bands or so, in Google Earth Engine
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16 views

QGIS georeferencer's output incomplete

I am georeferencing some tiff images in QGIS using the same settings for the goereferencer's parameters. A couple of images were referenced fine but for others the georeferenced output raster is ...
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1answer
869 views

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: ...
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16 views

Fixing local orthorectification mismatches leading to small georeferencing errors?

My project uses good quality high resolution orthorectified imagery (from the government) as its reference base layer. I complement it for vegetation analysis with additional imagery from a different ...
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52 views

Downloading Google Earth images in universal map downloader

How can I download Google Earth images in universal map downloader in 2015 and 2020? There isn't any specific option for select year.
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2answers
61 views

Should I always choose Sentinel-2 atmospheric-corrected imagery?

Sentinel-2 imagery is available in the default L1C form, or in the atmospheric-corrected L2A form. I haven't been able to find a L1C - versus - L2A comparison that would provide the pros and cons of ...
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1answer
383 views

KMZ with orthomosaic shows white squares with red Xs when zooming in Google Earth Pro?

Every time in the morning when I first open my Google Earth Pro, Why does my kmz that has an orthomosaic show white squares with red X's when you zoom in? Here is a screenshot: I tried to clear out ...
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13 views

Planet Images with Blurry Patches

I have downloaded some Planet imagery from the tropics (available for free), but the images have these blurry patches. Does anyone know what these are?
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1answer
264 views

Site Location Maps without Bing

The introduction of Bing Imagery with the release of ArcGIS 10.0 provided a fantastic means to very quickly produce Site Location Maps. Prior to its' introduction, I was using a GIS server connection ...
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4answers
5k 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 ...
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1answer
56 views

ArcGIS Online and Nearmap Basemap Imagery

I am trying to get an exported Nearmap imagery as my basemap for an ArcGIS Online map. I have the Nearmap Image and it's respective georeference file (JPG File and JGW File). Is there a way to upload ...
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5answers
17k views

Creating polygon with extents of raster file in QGIS

I have a tiff image file and want to get a polygon with the extent of the tiff. Is there a direct way of doing this? Right now I have to convert the image to vector (with gdal_polygonize) and then ...
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2answers
262 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 ...
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Can't upload raster file on PostGIS

I've been trying to upload my satellite imagery which is 1.5 GB to my PostgreSQL database, using the code below, the error for each command is stated below; raster2pgsql -s 4326 -t auto -F -I -C -Y '....
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1answer
3k views

Mosaicking rasters in GRASS GIS

I am a new user of GRASS GIS. How can I mosaic different satellite imageries using GRASS GUI? I was trying to use i.image.mosaic, but could not succeed. I have been looking for an online tutorial but ...
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1answer
266 views

Increase contrast of merged Planet Labs scenes

I've download a few PlanetScope scenes from Celaya, MX. Taken alone they have a good contrast. Then I've merged them with gdalbuildvrt, which lowered the contrast: Link I've thought, that I could ...
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1answer
23 views

Image collection images to a 1D vector where there is one value corresponding to each image

I am currently working with MODI's land surface temperature image collection dataset of 20 years of data. I want to convert each image to a single value representation using mean/max function. I tried ...
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1answer
69 views

Mosaic to New Raster with no output

I have a large set of 4-band high resolution NAIP imagery that I had put into a mosaic and am now trying to create a raster using the Mosaic to New Raster tool. When run the tool just says 'mosaic is ...
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1answer
28 views

Automate making imagery index layer

I am wanting to come up with a way to speed up my Imagery Index layer. To give you an overview I have about 500 imagery files. They cover extents all over Australia. I am wanting to create a shapefile ...
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2answers
64 views

Creating ArcMap where two parts of different imagery basemaps are visible at once?

I'm using ArcMap to create backgrounds for a book of poetry where the backgrounds of poems are satellite imagery. I would like to have a section of my map be from a BW image and another from a ...
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1answer
111 views

Saving as/export results of GeoVisual Search (Descartes Labs)

I am working with satellite imagery processing. I'm using this service to search for some objects in the US: https://search.descarteslabs.com Can I export about 1k results, for example, to KML or ...
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204 views

Cloud Masking of Sentinel-2-L2A images

I am trying to follow this Tutorial but in a different country. I am currently having a problem with cloud masks. I tried to visualize the different cloud masks of different patches at different dates....
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1answer
58 views

How to get whole image exported from Google Earth Engine?

I used the LANDSAT 8 TOA data to create an NDVI image. I want to export the image to my Drive. I have most of the code and it works, but I can't get the whole image in the export. It should cover the ...
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20 views

Is there a way to detect the status of the Esri world imagery basemap service programmatically prior to opening an MXD?

We have a web application that programmatically exports an MXD to a PDF. In this MXD, we have Esri's world imagery service added in one of the dataframes. However, when the imagery service is down ...
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1answer
953 views

What causes rainbow image artifact in Google Maps satellite imagery?

I discovered this "rainbow" over the Yellowstone River in Google Maps: View the site in Google Maps: https://goo.gl/maps/y6xETmY859M2 You can see a distinct red, yellow, and blue streak ...
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5answers
841 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 ...
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1answer
70 views

Unable to activate analytic asset in satellite Imagery

I was trying to import the map of Melbourne. I was able to fetch the details from API coordinates but when i am trying to check the analytic asset status, it is returning inactive. # extract image ...
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0answers
11 views

Getting the imageID within a set of images (imageCollection) using the targeted coordinate

I am trying to download a high solution satellite image of a targeted area (roughly 30m * 30m) with (-80.562459, 43.470784) as the center. This is my approach. I am accessing the skysat dataset: https:...
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2answers
126 views

Combining imagery, masking and sampling in Descartes Labs Platform

I am trying to sample data from Descartes Lab imagery to train a random forest classifier in the Descartes Plaform for an agricultural region. I have already written a script to prepare the imagery of ...
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1answer
64 views

Reprojection issue in Image collection after Filtering using Google Earth Engine

I am trying to reproject an image collection, but it fails after I apply filtering by (space, time, and cloudy cover percentage)!? Here is the code: Map.centerObject(geometry); var S2_f = S2....
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10 views

Graph of the variation in time of the nival surface

How do I calculate the area of snow for all the images in a collection image? When I apply the script it only calculates me from an image. And after to generate a chart var landsat = ee....
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1answer
153 views

Is it possible to export the Google Earth Engine basemap (satellite version, not map), instead of something from an image collection?

I was originally going to use Landsat8 or Sentinel Data, but they don't go as clear as I thought they would. I'm looking for something at around 1m per pixel (Landsat8 is about 30m per pixel), like ...
3
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2answers
4k views

How to convert GeoTIFF to grayscale and add gaussian blur?

I have a giant GeoTIFF I'd like to convert to grayscale and add a gaussian blur to. As far as I know, GDAL can strip two of the three color bands and call it grayscale, which might work, but is there ...
3
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1answer
2k views

Downloading image/exporting image to google drive from google earth engine with color palette

When I download Analysis results from Google Earth Engine, the image is exported in to google drive but it does not have a color palette. How do i add color palette with the exported image using earth ...
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12answers
34k views

Redefining 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 ...
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0answers
22 views

Custom Sensor type for New Ortho Mapping Workspace in ArcGIS Pro

Is it possible to bring a sensor type (Satellite) which is not yet included in the available sensor list to create a new Ortho Mapping Workspace in ArcGIS Pro using Python ?? for example the sensor ...
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1answer
764 views

Downloading OpenStreetMap and Imagery to ArcGIS Collector for Offline Use?

I am traveling to Costa Rica and would like to use Collector with my cell phone to record some information in a feature class. I would like to find some 1m or better imagery to put in a web map that ...
7
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1answer
270 views

Determining Bounding Points of UAV Images

I know the EXIF data from drones contains the GPS point central to the photo to provide photo location. What I'd like is to determine the lat/lon of the four corners of the image. I've done a pretty ...
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1answer
144 views

Dataset description AREA_OR_POINT

What are the differences between these two options in satellite image metadata?
3
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2answers
175 views

Writting into XMP and EXIF Metadata from attribute table values in PyQGIS

I've already learnt how to read EXIF and XMP data's from JPG. Now I would like to write from value in attribute table into their XMP and EXIF tags. This code Import EXIF / XMP , and I would like to ...
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1answer
403 views

Using rasterio to crop image using pixel coordinates instead of geographic coordinates

I'm trying to extract a series of random patches of image from a larger satellite image (from worldview3). I want to extract patches of uniform size (say 512x512 for example). If it were a normal ...
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1answer
197 views

Merge neighboring image tiles into a single image

I have a set of satellite image tiles from Bing Maps (info here). The tiles' names specify tile coordinates within the tile system and zoom, e.g. 156608-142775-18.jpg. An example set of tiles: ['...
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2answers
7k views

How to visualize multiband imagery using rasterio?

How do I plot a satellite image using rasterio? I'm able to plot the individual bands but not the entire image. Is there a way to combine the separate R, G, B numpy arrays to create a standard RGB ...
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0answers
12 views

No data values collars error - delete values from image

I have a satellite image that has collars outside of the image. When I set no data value as 0 and set this colors as no display it also removes the pixels from the image with 0 - RGB. The image is ...
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1answer
112 views

Why using buffers in land use / land cover classification task?

I am following the tutorial How To: Land-Use-Land-Cover Prediction for Slovenia and I would like to understand why they used a positive buffer (expanding boundary limits) in the first part of the ...
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2answers
89 views

Interpretation of NDVI values

This might be a trivial question, but please bear with me. So I am using python and Sentinel images and I want to calculate NDVI, which is (NIR-RED)/(NIR+RED). So in the case where the final result ...
7
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3answers
4k 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?

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