Monitor an Area Without QGIS

Yes. QGIS is excellent free desktop GIS software, but it must be installed, and setting up ongoing satellite monitoring in it means manually sourcing imagery, loading layers, computing indices, and repeating the process for each new date. Off-Nadir Delta does this in the browser: you draw an area, choose a metric (NDVI, SAR backscatter, NDWI), and it builds the time series and flags anomalies automatically — nothing to install.

QGIS is a general-purpose desktop GIS for editing, styling, and analyzing all kinds of geospatial data, with deep functionality and a plugin ecosystem. Off-Nadir Delta is a focused, browser-based application for monitoring specific areas with satellite imagery over time. QGIS gives you broad manual control on your computer; Off-Nadir Delta gives you automated, repeatable area monitoring online.

Not with Off-Nadir Delta. Imagery is searched, processed, and visualized online, so there are no large GeoTIFF downloads to manage. A typical QGIS monitoring workflow, by contrast, involves downloading scenes for each date you want to analyze.

QGIS remains the better choice when you need full cartographic control, custom geoprocessing, vector editing, offline work, or integration with a wider GIS workflow. If your goal is specifically to watch how an area changes over time without installing software, a browser-based monitoring tool is faster to set up and maintain.

You can start free. QGIS itself is free and open-source desktop software; Off-Nadir Delta offers a free tier to set up and run area monitoring online, with paid plans for higher usage. See the pricing page for current details.

Yes. Off-Nadir Delta supports uploading your own GeoTIFF and GeoJSON files to visualize alongside satellite imagery, so you are not limited to built-in data sources.