Technical Help

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FAQ

• What is Mean NDVI?
  Calculations of NDVI for a given pixel always result in a number that ranges from minus one (-1) to plus one (+1). The Mean is the average of all the indices. We calculate this mean for each row or block to give you an idea of the average growth rate for that block.
• Can I view my imagery with a GIS client?
  We have the ability to set up your images to be on our WMS server. There are multiple web-based clients to view the images from that WMS: OpenLayers, Mapfish or GeoExt. Contact support to learn more.
• Why do you include weather data in reports?
  Atmospheric conditions can have an affect on the images. We provide all the data pertaining to a flight so that you can take into consideration all the variables when evaluating the imagery.
• Can I view other data besides imagery?
  Some customers find it extremely valuable to provide irrigation data, pressure bomb data or soil nutrient data. Looking at multiple sources of data for their farms provides a more complete picture of health. Contact support to talk with someone about adding in more data to have it all in one place.
• Can I set up a one-time flight?
  Yes! We are here to help. Contact support to schedule that.

NDVI vs NDRE

​Pollen Systems uses two different formulas to measure the growth patterns and stress of wine grapes, known as Normalized Difference Vegetation Index (NDVI) and Normalized Difference Red Edge (NDRE). NDVI is a formula to determine the rate of photosynthesis of a plant, which can represent the overall health and vigor of a crop, while NDRE measures the above ground vegetationof the plant. Both formulas hold an expected range of -1.0 to +1.0, where the lower the number, the lower the rate of photosynthesis and plant mass. Numbers below -1.0 are often roads or buildings. In the maps included in our scouting reports, green represents high NDVI and NDRE, while red/brown represents low NDVI and NDRE.