Geo Data Collector vs TopoWalk

Geo Data Collector turns your iPhone or iPad into an offline-first field GIS for mapping, asset inspection, structured data collection, surveying calculations, and construction layout job preparation. FIELD DATA COLLECTION • Capture points, lines, and polygons with attributes and photos. • Build forms in the app or import shareable JSON form designs. • Mark fields as required or optional and use text, number, date, checkbox, radio-button, and selection controls. • Review, search, edit, delete, and return to collected features on the map. EXTERNAL GNSS, RTK & NTRIP • Connect a compatible Bluetooth GNSS receiver that outputs NMEA 0183. • Stream validated RTCM 3 corrections from NTRIP v1/v2 RTN or CORS casters to the external rover. • Monitor fix type, receiver-reported accuracy, DOP, satellite count, signal quality, correction age, and data freshness. • Apply configurable quality gates, stable-fix checks, and ECEF/ENU point averaging before capture. • Preserve observations, occupations, antenna information, quality decisions, and available coordinate-operation provenance in versioned archives. The external receiver computes the RTK position solution. Achievable accuracy depends on the receiver, antenna, environment, correction service, configuration, and field procedures. SURVEYING & GEODESY TOOLS • Planar COGO inverse and forward calculations. • WGS84 geodesic inverse and direct calculations. • Polygon area, perimeter, orientation, and centroid. • Slope distance, grade, inclination, and elevation difference. • Stakeout deltas, Bowditch traverse adjustment, and angular-closure diagnostics. • WGS84 ECEF/UTM operations, explicit control localization, and auditable geodesy reports. CONSTRUCTION LAYOUT PREPARATION • Create and manage layout jobs and design targets. • Import targets from supported GeoJSON and CSV/ASCII point files. • Configure metric, international-foot, or US-survey-foot units and horizontal/vertical tolerances. • Build a 2D site localization from control pairs and review residual diagnostics. • Export as-built CSV, stake-report JSON, and Markdown field reports. OFFLINE MAPS & OPEN DATA • Work with GeoPackage, GeoJSON, raster MBTiles, and vector MBTiles. • Use online and offline basemaps, including vector, terrain/topographic, hillshade, satellite, and boundary layers where available. • Browse searchable attribute tables and control layer styling, visibility, opacity, and display order. • Convert supported vector formats, including zipped Shapefile, KML, GPX, CSV, and WKT, into app-ready data. FIELD OPERATIONS • Measure distance and area, record GPS tracks, search OpenStreetMap, save spatial bookmarks, and view coordinates in multiple formats. • Use offline field projects, field editing workflows, and geodesy/control reports. • Share files through supported cloud, FTP, WebDAV, and local Wi-Fi workflows. • Connect TAK Server and Meshtastic workflows for team position and messaging. Core collection and offline mapping do not require a proprietary server-side database. Some capabilities require compatible external hardware, network or correction services, imported data, or an in-app purchase. Geo Data Collector is a field mapping and construction aid. It does not replace a licensed surveyor, legal boundary determination, instrument calibration, or required professional quality-control procedures.

TopoWalk turns your iPhone into a GPS-guided land boundary walker. Load a trail file, walk the boundary, and watch waypoints turn green as you reach each one. WALK ANY BOUNDARY Load land parcels, property boundaries, or hiking trails from GPX, KML, DXF, and Shapefile formats. TopoWalk shows each waypoint on a satellite map with a yellow boundary line connecting them. GPS GUIDANCE Real-time distance to the next waypoint, off-trail warnings, and an audio chime when you arrive within 1 meter of each point. Never miss a boundary corner again. CONVERT BETWEEN FORMATS TopoWalk is the only app that converts between all major surveying and trail file formats. Import a KML cadastral map from a surveyor, convert it to GPX for your hiking app, export as DXF for AutoCAD, or save as Shapefile for GIS software. One tap to convert — no desktop software needed. Supported conversions: • GPX ↔ KML ↔ DXF ↔ Shapefile (SHP) • Import from email, Files app, or any cloud storage • Export and share in any format TRACK YOUR PROGRESS See how many waypoints you've visited, total distance walked, land area and perimeter calculations — all updating live as you walk. 44 WORLD LANDMARKS INCLUDED Explore boundaries of famous landmarks: Buckingham Palace, Taj Mahal, Vatican City, Stonehenge, Machu Picchu, Forbidden City, and many more — all with real satellite-accurate boundaries from OpenStreetMap. FREE FEATURES • GPX file support • GPS-guided walking with audio alerts • Progress tracking and distance display • 44 bundled world landmark trails TOPOWALK PRO (one-time purchase) • KML, DXF, and Shapefile import & export • Convert between all formats (GPX, KML, DXF, SHP) • Area and perimeter calculations • Share trails with others