> For the complete documentation index, see [llms.txt](https://docs.openbrim.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.openbrim.org/templates/highway-project-master-workflow/site-data-hpm.md). # Site Data \[HPM] The site the job sits on, rather than any structure standing on it: the roadway alignment and the surveyed ground surface. They share a group because they describe the same thing from two directions, and because a single LandXML import commonly produces both — an alignment and a TIN surface from one file. Everything here is published to the structure projects through **Cross-Project Data**, so a bridge on this corridor works from the same alignment and the same ground as its neighbours, rather than from a copy that can drift. --- # 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, and the optional `goal` query parameter: ``` GET https://docs.openbrim.org/templates/highway-project-master-workflow/site-data-hpm.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. 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.