wxGIS Portable vs. Desktop GIS: When to Use Each Tool

Quick Start Guide to wxGIS Portable for Surveyors

Overview

• Purpose: wxGIS Portable is a lightweight, portable GIS tailored for field surveyors who need offline mapping, quick data capture, and GPS integration without installing heavy desktop GIS software.
• Audience: Surveyors conducting field data collection, site verification, or small-scale mapping who need an easy, fast setup.

What you need before you start

1. Hardware: Windows laptop or tablet (USB port), or a Windows-capable device that can run portable apps.
2. GPS receiver: USB or Bluetooth GPS unit (or smartphone with GPS and Bluetooth serial bridge).
3. Storage: USB flash drive or external SSD for the portable installation and data.
4. Data files: Base maps (MBTiles, GeoTIFF, or shapefiles) and a simple schema for attributes (CSV or shapefile fields).

Installation (portable, no admin required)

1. Download the wxGIS Portable ZIP from the official source and extract it onto your USB drive or external SSD.
2. Place your base maps and vector layers in the program’s data folder (create a folder named “projects” or “data” beside the executable).
3. If using a Bluetooth GPS, pair it with your device and confirm the COM port; if using USB GPS, note its COM port.
4. Run the wxGIS Portable executable directly from the USB drive—no installer required.

Initial configuration

1. Open wxGIS Portable and create a new project: File → New Project → choose a projection (WGS84 for GPS-centric work).
2. Add base maps: Layer → Add Raster → select MBTiles/GeoTIFF, or Layer → Add Vector → choose shapefiles/GeoJSON.
3. Set the project CRS to match your inputs (use WGS84/UTM zone if accurate distance/area is needed).
4. Connect GPS: Tools → GPS → select COM port and baud rate (usually 4800, 9600, or 38400). Click Connect and verify you receive coordinates.
5. Configure snapping and snapping tolerance for precise digitizing: Settings → Digitizing → enable snapping to vertex/segment and set tolerance (e.g., 5–10 px).

Basic field workflows

1. Create a survey layer
   • Layer → New Vector Layer → choose point/line/polygon, set fields (ID, Type, Surveyor, Timestamp, Notes).
   • Save the layer in your project folder (shapefile or GeoPackage recommended).
2. Capture a point with GPS
   • Select the survey point layer and the “Add Feature” tool.
   • With GPS connected and showing location, click on the map (or use “Capture GPS” if available) to store the current coordinates into the point.
   • Fill attribute form and save.
3. Digitize lines and polygons
   • Use snapping and orthogonal constraints as needed.
   • For long features, enable track recording (if supported) to log GPS tracks and convert them to lines later.
4. Attach photos and notes
   • Save photos to the project folder and include a field with the relative photo path.
   • Use timestamps to sync photos with GPS points if automatic linking isn’t available.

Best practices for accuracy and reliability

• Use WAAS/RTK or higher-accuracy GPS if sub-meter precision is required; otherwise, consumer GPS may be ~3–10 m.
• Warm up the GPS: power on and let it acquire satellites for a few minutes before critical captures.
• Keep consistent CRS: store raw GPS in WGS84 and transform to local UTM or state plane if needed for analysis.
• Backup frequently: copy the project folder to another drive or cloud storage at the end of each day.
• Maintain metadata: include fields for surveyor, date/time, device, datum, and method to preserve data provenance.

Troubleshooting quick list

• No GPS fix: move to an open sky area, check COM port/baud, restart GPS, verify drivers.
• Layer not visible: confirm CRS matches project CRS; zoom to layer extent.
• Slow performance: reduce visible layers, use tiled MBTiles for rasters, move project to a faster drive.
• Attribute form not saving: ensure layer is writable and not open elsewhere; check file permissions.

Exporting and sharing results

1. Save final layers as GeoPackage for portability and attribute preservation.
2. Export shapefiles or GeoJSON for clients who require those formats.
3. Create simple maps: add legend, scale bar, north arrow, and export to PDF or PNG (File → Export Map).
4. Include a README with CRS, field definitions, and data collection notes.

Quick checklist before leaving the field

• GPS connected and logging working
• All survey features saved and attributed
• Photos copied into project folder and referenced
• Local backup created (USB or cloud)
• Project CRS and metadata documented

Further steps (optional)

• Integrate with desktop GIS for advanced processing (QGIS or ArcGIS).
• Use post-processing tools for differential correction (RTK/PPP) if high accuracy needed.
• Automate data sync with cloud services if an internet connection is available.

This guide gives you the minimum setup and workflows to start using wxGIS Portable for field surveying. Follow the best practices and checklist to ensure reliable, shareable survey data.