Field Data Collector
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Offline mobile GIS

Carry the job map beyond the network

Field work happens beyond reliable coverage. Field Data Collector reads raster and vector tiles, GIS features and tracks from local files so the operational map remains useful at the parcel, corridor, site or incident area.

Supported formats

Four offline formats, one map

MBTiles

Raster & vector tiles (EPSG:3857). Format auto-detected by tile header byte or format metadata.

PNGJPGpbf/mvt

GeoPackage

Raster tiles and styleable vector features. Browse tables in the attribute grid.

.gpkg

GeoJSON

Vector features with attributes. Styleable overlays and a feature grid.

.geojson.json

GPX

Tracks & waypoints — produced by the in-app GPS tracker and importable from elsewhere.

.gpx
Massive geospatial data

Three tile paths keep large field maps practical

Instead of loading an entire feature collection into memory as one overlay, the app’s local tile server delivers the part of the map requested for the current zoom and viewport.

01

Dynamic raster tiles from GPKG features

GeoPackage point, line and polygon tables are drawn into styled raster tiles on demand. This lets feature databases participate in a familiar slippy-map tile pipeline.

02

Cached vector tiles from MBTiles & GPKG

Prebuilt PBF / MVT tiles are read from MBTiles or GeoPackage vector-tile tables and served locally to Mapbox Classic as vector tile sources.

03

GL JSON stylesheet presentation

GL JSON styles connect local TileJSON sources with map layers, sprites and glyphs, preserving a coherent cartographic treatment across offline vector caches.

Why this matters in the field

Tile-based rendering limits work to the visible area and zoom level, making dense parcels, infrastructure, contours and regional reference data more manageable on a mobile device.

Layer management

Stack basemaps, grids & working layers

Load multiple local sources. Toggle and reorder layers, and mix raster basemaps with reference grids, parcels and vector overlays.

  • Use MGRS / GARS references and compatible hillshade, contour or imagery sources
  • Styleable GeoPackage & GeoJSON overlays
  • Import via Files / Finder sharing or the in-app document browser
  • Offline region & clip management
In-app vector converter

Move common vectors into GeoJSON

Launch a conversion workflow from inside the app when source data needs to become a GeoJSON overlay. The converter uses a network service and is separate from the offline map reader.

.shp (zip, WGS84) .kml .gpx .csv .wkt → .geojson

The vector converter is a connected feature; local MBTiles, GeoPackage, GeoJSON and GPX viewing remains the offline foundation.

Draw AOI
GeoRequest (AOI)

Don't have data? Clip it on demand.

Draw a bounding box, choose the layers and output formats you need, and the GeoRequest service clips and packages ready-to-use offline data for that area.

  • Outputs: .mbtiles & .gpkg
  • Status: In Progress → Ready to Download → Downloaded
  • Resubmit stalled requests automatically
  • Tiers: 1, 3, or 5 concurrent AOIs (yearly subscription)

Your map, offline — anywhere

Dynamic GeoPackage feature tiles, cached vector and raster packages, GeoJSON and GPX.

Download for iOS Next: TAK & Meshtastic →