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Missing metadata and problems with the tool Apparent Reflectance

  • February 20, 2023
  • 1 reply
  • 663 views

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Hello,

I'm a college student and not very proficient in using ArcGis Pro and Planet Imagery.
I would need advice on the Apparent Reflectance tool. I'm working with images from the PlanetScope satellite and I don't know where the problem is, but I don't see the metadata of the images. It's rejecting my data format. So I opened the metadata in a normal browser. To create I need Radiance Gain and Radinace Bias for each band. I'm not sure, but isn't it Radiometric Scale Factor and Reflectance Coefficient in the source current? Next I need the Sun Elevation, so I assume that is the same as the Illumination Elevation Angle? And I also know the Scale Factor and Offset, because it results from the number of bits in the image.
So I tried to use these values to create. But it told me that the Acquisition Date is missing, probably because I don't have the metadata uploaded there. So now I don't know what to do with it, because I have nowhere to write the Acquisition Date.

I will be grateful for any advice.

Thank you, Tereza

Best answer by asa

Hey Tereza, 

 

Thanks for reaching out! You can actually download Top of Atmosphere Analytic Radiance assets for PlanetScope 4-band and 8-band items directly from our ArcGIS Pro Add-In. Take a look for that asset in Step 2 “select assets” page in the Order Checkout window. Hopefully that helps minimize your post-processing workflow. You should also be able to access the metadata you’re looking for in the .json and .xml file that are downloaded when your order a PlanetScope item. 

 

Let me know if that helps. 

Best, 

Asa

1 reply

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  • Planeteer 🌎
  • Answer
  • February 28, 2023

Hey Tereza, 

 

Thanks for reaching out! You can actually download Top of Atmosphere Analytic Radiance assets for PlanetScope 4-band and 8-band items directly from our ArcGIS Pro Add-In. Take a look for that asset in Step 2 “select assets” page in the Order Checkout window. Hopefully that helps minimize your post-processing workflow. You should also be able to access the metadata you’re looking for in the .json and .xml file that are downloaded when your order a PlanetScope item. 

 

Let me know if that helps. 

Best, 

Asa