… Geometric Calibration The SDSU IP Lab provides rudimentary geometric accuracy verification for sensor systems using our set of ground control points (GCPs) located in and around Brookings, SD. For this type of calibration work, the customer provides us with imagery centered on Brookings, SD, using his or her sensor. Our staff measures how close the corresponding geolocated pixel in the image is to our calibrated GCPs. We record these data … directions for Ground Control Points (GCPs) at the Brookings, SD site recorded by this sensor. It can be seen that there is a systematic error of approximately 5 meters in the easting component. However, the red circle denotes the specification for the sensor in terms of CE90 which specifies that 90% of the GCPs must lie within that circle. Hence, the customer can …
… Radiometric Calibration Radiometric Calibration refers to the ability to convert the digital numbers recorded by satellite imaging systems into physical units. Those units are either radiance (W/m2/sr/µm) or apparent top-of-atmosphere reflectance. Vicarious-based Absolute This type of calibration is performed … be used as a reference radiometer. Currently, we use the MODIS satellite sensors as our calibrated radiometer. This sensor monitors the upwelling radiance of the PICS locations. By comparing customer’s sensor’s measurement to this reference value, calibration correction coefficients can be generated for the customer. An example of the output data produced from …