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5 Topics
crmora
crmora
asked in SkySat
Skysat - Vegetation Indexes

Dear allI’m working with a set of images collected through satellite tasking and would like to calculate some vegetation indexes such as NDVI and EVI. I have downloaded the TOA and SR images (both 16-bit unsigned raster). I tried re-scaling each band by the maximum pixel value before calculating the indexes and it seems to work for NDVI but not for EVI, which returns indexes completely out of range (for both, TOA and SR). This result makes me wonder if the NDVI I calculated is correct. Does anyone have experience with something similar and can recommend a procedure or reference to a material that can help me understand how to work with the imagery for this purpose?ThanksCM 

120
crmora
2 days ago
PKK
PKK
asked in PlanetScope
PlanetScope VIs calculation

Hello I’m a beginner in GIS and have a few questions about calculating vegetation indices (VIs). Here are the details of my process: I have PlanetScope images (4 bands, 3B_AnalyticMS_SR). I successfully calculated NDVI, and the result was as expected, ranging from -1 to +1. However, when I tried to calculate EVI using this formula (2.5 * (NIR - Red) / ((NIR + 6 * Red - 7.5 * Blue) + 1), the results were strange, ranging from about -8000 to 6000. To address this, I normalized the band values (since some values exceeded 10,000) by dividing by 10,000. But even after that, some values were still greater than 1, which didn’t help. Then, I found a suggestion from somewhere in this community that I should convert the bands to TOA reflectance using coefficients from the metadata because the initial values are in Digital Numbers (DNs). After doing this, I got EVI values within the expected range of -1 to +1. But I’m not sure if this solution is correct. So, I have a few questions:Is the solutio

300
PKK
11 days ago
emerysilb
emerysilb‎‎ 🌱
asked in APIs
Education and research XYZ tile server low resolution and downloads credit

Only zoom tiles load atHi,I’m trying to implement the tile server using the education and research license, but it only seems to show a low resolution version of the data. What’s the process to load the full resolution tiles?  Also, I tried using the API to get 13 acres of data using a clip in the API for the AOI, but it used about half my Downloads Scene credit. Is it possible to collect data without having the entire tile count against credit used?  Thank you!  

361
elyhienrich
Community Manager 🌎
11 days ago
brunj7
brunj7‎‎ 🌱
asked in APIs
How to a I create a Geometry Filter from geojson file in Python?

Hi,Is there a way to create a Geometry Filter using defining the AOI directly from a geojson file in Python (ideally using geopandas)? The only examples I am seeing in tutorials is about copy-pasting coordinates, but I hope there is a more automated way to do this.Thank you!

603
Steve Hillier
Planeteer 🌎
13 days ago
Varaha_RS
Varaha_RS‎‎ 🌱
asked in PlanetScope
RGB reflectance ranges for proper RGB layer display on QGIS

I am having trouble in getting a clear display of a true color composite (TCI) of a harvested farm in north of India in QGIS. I am using Planetscope image of 2024 from the 8-band Superdove collection. This is a 2.5 acre farm. The TCI content is getting obscured by rainbow effect (‘Unclear.png’). The band ranges and other symbology details are given in ‘Unclear_specs.png’). I have attached a screenshot of the metadata of this farm for reference (‘Unclear_metadata.png’). What band value ranges or other parameters should I edit to see a clearer image?FYR, I have attached screenshots in the three categories for a larger farm (14 acres) that is harvested in one plot and tilled in other plots: Clear_14ac.png, Clear_14ac_specs.png, Clear_14ac_metadata.png. This farm has a very clear view. The clear confidence percent for this image is 95 as compared to the unclear farm (85) but that should not produce such a drastic difference in clarity given the clear percent in both images is 100.Please he

371
elyhienrich
Community Manager 🌎
19 days ago
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