> For the complete documentation index, see [llms.txt](https://changelog.visilean.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://changelog.visilean.com/changelog/release-3.0-2026/geotiff-overlay-in-maps.md). # GeoTIFF Overlay in Maps Drone surveys and aerial photography have become standard practice on construction sites but the imagery they produce usually ends up in a separate GIS tool or shared as standalone files with no spatial context inside the project management platform. When a project manager wants to compare the latest drone capture against the planned layout, or a site engineer needs to verify earthwork progress against the programme, they have to switch systems, manually cross-reference locations, and piece together the picture themselves. #### Why This Matters Construction sites change daily. Earthworks reshape terrain, temporary structures appear and disappear, and access routes shift as work progresses. Drone imagery captures this reality with precision but only if teams can see it in context alongside their tasks, zones, and planned layouts. When the imagery lives in a disconnected tool, the spatial intelligence it carries stays siloed. Progress verification becomes slower, discrepancies between plan and reality are spotted later, and safety or access concerns visible in aerial imagery don't reach the people managing the schedule. #### What's New? * **GeoTIFF file overlay:** Upload a GeoTIFF file and it renders directly on your project map as a positioned overlay, aligned automatically using the file's embedded geo-coordinates. * **Accurate geo-location:** The overlay sits at the correct real-world position on the map, so what you see matches exactly where it is on site. No manual positioning or scaling required. * **Latest site imagery in context:** View drone orthophotos, aerial survey captures, or satellite imagery layered over your project map without leaving VisiLean or switching to a GIS application. * **Visual progress monitoring:** Compare planned site layouts against actual conditions captured in the imagery, making it easier to verify progress, spot discrepancies, and flag site access or safety concerns. #### How It Helps A *Project Manager* uploads the latest fortnightly drone orthophoto as a GeoTIFF overlay before a progress review meeting. The imagery sits directly on the project map, and the team can visually compare the as-built state against the planned layout identifying areas where earthworks are ahead of schedule and zones where access roads have shifted from the original plan, all without opening a separate GIS tool. A *Site Engineer* checking safety conditions after heavy rainfall opens the maps view with the most recent aerial capture overlaid. The imagery shows standing water near a planned excavation zone, prompting the engineer to flag a constraint and delay the activity until drainage is confirmed a decision made in seconds because the imagery and the schedule live in the same view. A *Senior Planner* overlays successive monthly drone captures to build a visual timeline of site progress. By switching between overlays, they can demonstrate to the client exactly how the site has evolved grounding programme discussions in photographic evidence rather than abstract schedule bars. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://changelog.visilean.com/changelog/release-3.0-2026/geotiff-overlay-in-maps.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.