Octo prepares
Surveys, calculates, organizes and produces the documents: spreadsheets, reports, sheets, maps and drafts.
Deliverable: material ready to checkOcto × Cartography · research as of October 31, 2026
From projection to PEC, in batch and on a copy.
Reference frame transformations, systematic mapping sheets in batch, vector datasets in ET-EDGV, generalization, thematic maps, print atlases, tiles for the web and PEC assessment. What can be automated with GDAL, PROJ, QGIS, PostGIS and tiles, and where Octo helps: it reads the dataset, writes the script, processes on a copy and shows the proof map and the numbers. Approval and technical responsibility stay with the licensed professional. The cartographer signs.
Workstreams8one page per workstream
Confirmed32points with a published source across the eight pages
Sources115references listed at the end of the eight pages
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Octo at work in cartography.
One task from request to approval, at a fictional company. The arms measure, plan and execute; the person in charge checks and approves. Each tab is a workstream in the field and leads to its page.
Octo · task #941 · Cartográfica Serra do Leme (fictional company)
Workstream pageProjections →Systematic →Quality and PEC →
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One page per workstream.
With the tools, how they are automated through the command line, scripts or APIs, where Octo can help and what is confirmed by a published source.
Projections and geodesy
SIRGAS 2000, UTM, PROJ pipelines and transformation grids, area and scale distortion, EPSG codes. Octo can identify the reference frame of each layer, propose the transformation and measure the shift before reprojecting.
Open the page →Systematic mapping
Systematic mapping, sheet indexing, sheet index codes, scales and topographic maps. Octo can generate the sheet grid for a block and produce all sheets with the same layout, for the cartographer to review sheet by sheet.
Open the page →ET-EDGV and vector datasets
Modeling in ET-EDGV 3.0 on PostGIS, topology validation, IBGE's continuous datasets and conversion between models. Octo can load and validate the dataset and list each error with its location, so the fix is decided by whoever is accountable for the product.
Open the page →Generalization
Simplification, aggregation, displacement and selection by scale, with Douglas-Peucker, Visvalingam and open-source tools. Octo can generate versions by scale and measure what changed, with the final cartographic judgment made by a person.
Open the page →Thematic mapping
Choropleths, classification, proportional symbols, cartograms, flow maps and IBGE data. Octo can join the table to the boundaries, test classifications and show how each one changes the reading, with the final choice made by whoever signs the map.
Open the page →Symbology and print
QML and SLD styles, QGIS layouts and atlases in batch, PDF and GeoPDF, print color, place names and labeling. Octo can export the whole atlas and check the scale, labels and colors of each page, for the final proof to be approved by a person.
Open the page →Web maps and tiles
Vector tiles in MVT and PMTiles, tippecanoe, MapLibre styles, raster tiles and OGC services. Octo can generate the tiles, write the style and check the map at each zoom level before someone publishes it.
Open the page →Quality and PEC
PEC-PCD, ISO 19157, positional accuracy with checkpoints, quality reports and metadata. Octo can compute the discrepancies and put together the report, with the product's classification signed by the technical lead.
Open the page →
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What it's like to use.
People ask in plain language, the way they would talk to a production colleague: "generate the 1:25,000 sheets for this block with the standard layout" or "reproject this dataset to SIRGAS 2000 and tell me how far it moved". Octo reads, proposes, processes on a copy and shows the proof map.
01 To get started
Access to the source data
Vectors, imagery, models and checkpoints in a folder or database Octo can read. The official dataset is never changed.
02 For open-source tools
Linux or Windows with GDAL, PROJ and QGIS
The free tools run on a regular server or workstation, in batch and with no per-machine license. PostGIS when the data lives in a database.
03 For proprietary tools
A machine with the licensed software
When the routine uses commercial software, it runs on the machine where that software is installed and licensed, through the automation options it provides.
No changes at the start
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Eight arms, one map.
The same Octo cycle, applied to cartographic production. Each arm has a narrow role; the ones who choose the delivery projection, approve the generalization, approve the product and sign are people.
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Discovery
Surveys what already exists
Formats, declared and missing reference frames, source scales, styles, layouts, old scripts and where the official dataset lives.
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Data
Pins down the references
Datum, projection, zone, production scale, data model (ET-EDGV or another), keys such as the municipality code, and which one is the official dataset and which one is the copy.
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Security
Takes care of access and data
Read access to the official dataset, no password in scripts. Sensitive or defense data and personal data in cadastral datasets are assessed with the client before anything leaves the environment.
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Architecture
Picks the path
ogr2ogror SQL in PostGIS;qgis_processor PyQGIS; vector or raster tiles; one sheet per process or a single batch. -
Development
Writes the script
Bash, Python or SQL, with a log per run, exit code, a trial with one sheet or one municipality and the source of each syntax noted.
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Review
Checks on a known case
Compares with a sheet or map already approved: same extent, same scale. Checks by the proof map and the numbers, not by the absence of errors.
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Release
Delivers for approval
Only with your OK, it generates the PDF, the tiles or the service in a staging area. Official publication is done by a person.
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Documentation
Keeps a record
Script, parameters, transformation used, sources, metadata and what was decided are written down for the next edition of the map.
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What this page is, and what it isn't.
Only what has a published source makes it into the field's pages: each point carries its reference, and each page ends with its list of sources.
32
points with a published source across the field's eight pages, each with its reference on the page itself.
- Illustrations with fictitious data
- Maps, sheets and diagrams are original SVG drawings. Boundaries, coordinates, place names, sheet codes and values do not correspond to real places or statistics.Each one is captioned "Illustration: ... fictitious data"
- Standards and versions
- Technical standards, public agency requirements and software versions only appear with a source and date. ABNT and DSG standards appear only as a link to the catalog or the official source, without copying the text.Sources at the end of each page
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What Octo does and what stays with you.
Octo prepares everything, but does not sign. The document of record stays with whoever is accountable for it.
Your team checks
The licensed professional checks what Octo delivered before signing. If something doesn't add up, it goes back to Octo with the correction.
Step: review by the signerWho signs
Octo does not sign. Designs, technical reports, ART/RRT (Brazil's professional responsibility records), accountability reports and any official document are still signed by the company's or agency's licensed professional: here, the cartographic engineer or another licensed professional, with an ART; official data goes into the INDE only after approval by the competent authority.
Sign-off: licensed professional, with ART
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Sources.
Primary sources, accessed on October 31, 2026. Each page in the field ends with its full list.
- Decree 89.817, of June 20, 1984Planalto · Regulatory Instructions for the Technical Standards of National Cartography, with the Cartographic Accuracy Standard (articles 8 and 9)
- ISO 19157-1:2023ISO catalog · Geographic information, data quality, part 1: general requirements
- IBGE · continuous cartographic datasetsIBGE file server · versions and technical documentation
- DSG · models (ET-EDGV 3.0)dsgoficial organization repository · EDGV 3.0 specification and auxiliary files
- PROJOfficial documentation · coordinate transformations, pipelines and grids
- GDAL/OGROfficial documentation · command-line programs for raster and vector
- QGIS · qgis_processQGIS manual · processing algorithms from the command line
- PostGISOfficial documentation · spatial database on PostgreSQL
- tippecanoeOfficial repository · vector tile generation
- Projections and geodesysources at the end of the page
- Systematic mappingsources at the end of the page
- ET-EDGV and vector datasetssources at the end of the page
- Generalizationsources at the end of the page
- Thematic mappingsources at the end of the page
- Symbology and printsources at the end of the page
- Web maps and tilessources at the end of the page
- Quality and PECsources at the end of the page
Which step is holding up your cartographic production?
The assessment starts by reading a map or dataset your team has already made, without changing anything. You get a map of what can be automated, with a trial on a known case, and decide with it in hand.