Octo for georeferencing rural properties
Almost everything that gets a SIGEF submission rejected can be checked by script beforehand: the code and type of each vertex, a compatible method, the accuracy required for each boundary type, the perimeter's direction, adjoining owners and overlap with certified parcels, CAR, conservation units and Indigenous lands. Octo prepares that check and the draft legal description. Identifying boundaries in the field, answering for the ART or TRT and submitting to SIGEF are acts of the accredited professional.
Six possible deliverables, drawn from the research. All of them start from coordinates already processed by the office and go to the accredited professional accountable for the work to check.
The code and type of each vertex, a positioning method compatible with the vertex and the boundary, and σP against 0.50, 3.00 or 7.50 m, depending on the boundary type.
Deliverable: report with errors and warnings per vertexWrites the checked vertices into a copy of the SIGEF ODS spreadsheet. Holder, CPF and identification are left for the accredited professional to enter in LibreOffice with the official extension.
Deliverable: copy of the spreadsheet with the perimeter tabCrosses the perimeter against SIGEF and SNCI parcels, CAR, conservation units and Indigenous lands, measures each sliver and separates what blocks submission from what is only a warning.
Deliverable: CSV and GeoJSON of the slivers, to open in QGISGauss area in the local geodetic system, azimuths, distances and adjoining owners for each segment, to check against the property registration before SIGEF's official description.
Deliverable: draft and list of adjoining ownersFinds the adjoining parcels in the Acervo Fundiário shapefile and their vertex codes, which the manual requires on the shared boundary.
Deliverable: list of the neighbor's vertices for the accredited professional to check in the fieldInventories, per property, what chapter 4 of the manual requires to be kept: registrations, field books, RINEX and native files, processing reports, and points out what is missing.
Deliverable: checklist per property, with file hashesThe same Octo cycle, applied to georeferencing. Each arm has a narrow role; the one who identifies boundaries, signs and submits is the accredited professional.
CSV files and processing reports, old spreadsheets, scanned registrations, equipment used, reference frame and whether there is a certified neighboring parcel.
SIRGAS 2000, sigma units, the accredited professional's code convention and which file is the source: the processing, not the spreadsheet.
CPF (Brazilian taxpayer ID), holder name and registrations are personal data (LGPD): they stay out of scripts and external services without an agreement with the client. The SIGEF login never goes through Octo.
A custom script or headless LibreOffice, QGIS for viewing, which datasets to cross and what stops the pipeline.
Validator, overlay and draft legal description in Python, with the manual item for each rule noted in the file.
The script's area and description must match the SIGEF PDF of a known parcel. Checks by the numbers, not by the absence of errors.
Validation report, overlap slivers, draft legal description and pre-filled spreadsheet go to the accredited professional. Submission to SIGEF is theirs.
Manual edition, template spreadsheet version, date and hash of the datasets and the result of each check, property by property.
Octo works with read access and in a support role. It does not identify boundaries, does not sign, does not submit to SIGEF and does not decide on overlaps: that belongs to the accredited professional, with an ART or TRT.
The criteria Octo uses to choose, always checking SIGEF's documents page first.
| Task | Path | Notes |
|---|---|---|
| Know the current standard | MTGIR 2nd ed. (Ordinance 2.502/2022) and Certification Management Manual 2nd ed. (Ordinance 03/2023) | Check before every job |
| Check codes and accuracies | Spreadsheet check script | Rules of template spreadsheet 1.4 rc5 |
| Build the spreadsheet | Template spreadsheet + LibreOffice + SIGEF extension | The script only pre-fills the vertices |
| See certified neighbors | Acervo Fundiário, shapefile by state | Record date and hash |
| See CAR in the surroundings | consulta.car.gov.br | A warning, not a block |
| See conservation units and Indigenous land | CNUC (MMA) and FUNAI | Overlap goes to the responsible body |
| Calculate area the way SIGEF does | SGL with origin at the geocentric mean + Gauss | The official area is SIGEF's |
| Check the legal description | Own draft against the SIGEF PDF | A difference becomes a question for the accredited professional |
| Split a certified parcel | SIGEF, with a specific ART/TRT | Adding a vertex: 0.5 m automatic; up to 9.0 m with review |
| Submit | SIGEF, by the accredited professional | A personal act; no public API found |
Three steps. Each one only makes sense after the previous one has shown results in your office.
A proposal, not a promise
You send a property's CSV and get back the list of what the manual and the template spreadsheet would reject.
Validation, overlap with the day's datasets and the draft legal description come out together, in a pipeline that stops at the first error.
Each property with its own record: manual edition used, datasets and hashes, check results and records kept.
Every point below has a source published by the responsible agency (Planalto, INCRA, IBGE, ANAC, DECEA), by the vendor or by the project. ABNT standards appear only by number and title. The sources are in the next section.
4
points with a published source, each with its reference shown alongside.
Octo prepares everything, but it does not sign. The document of record stays with whoever is accountable for it.
Surveys, calculates, organizes and produces the documents: spreadsheets, reports, drawings and draft legal descriptions.
Deliverable: material ready to checkThe licensed professional checks what Octo delivered before signing. If something doesn't add up, it goes back to Octo with the correction.
Step: checked by the person who signsOcto does not sign. Designs, technical reports, ART/RRT, statements of account and any official document are still signed by the licensed professional at the company or agency: here, the surveying or cartographic engineer with an ART filed with CREA, or the surveying technician with a TRT filed with CRT; for rural properties, the professional accredited by INCRA, who submits to SIGEF.
Signature: licensed professional, with ART or TRTDocuments from INCRA, the Office of the President and public datasets used in the research, consulted on Oct 31, 2026.
The assessment starts with a property your office has already certified, without touching what is in SIGEF. You get the check Octo would have run before submission, compared with what actually happened, and you decide with that in hand.
