- Several different satellite instruments measure Aerosol Optical Depth, yet they often do not agree with each other, nor with in situ measurements. The Aerostat tool was developed in order to provide a platform for investigating these variations. Built on the Giovanni platform, it supports intercomparisons of aerosol measurements from the Multi-Angle Imaging Spectroradiometer (MISR) and the two Moderate Resolution Imaging Spectroradiometer (MODIS) instruments, as well as ground measurements from the AErosol RObotic NETwork (AERONET). In addition, Aerostat includes an optional neural-network-based statistical adjustment of biases. Aerostat also supports the merging and map display of multiple level 2 (satellite swath) aerosol datasets, with optional bias adjustment. The result is a capability to support intercomparisons and merging at a level not seen before in an online tool.