Photogrammetry
Point Cloud Classification: Ground, Vegetation & Buildings
Classify drone point clouds into ground/vegetation/buildings with Metashape, LAStools, PDAL, CloudCompare, ArcGIS Pro. Tool decision framework.
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Tag Archive
photogrammetry
29 articles on photogrammetry. Field-tested methodology from a GIS scientist with M.S. GIS, FAA Part 107, and 10+ years of geospatial work.
Photogrammetry
Metashape Processing Settings: What Each One Actually Does
A practitioner's guide to Agisoft Metashape processing settings: what each quality slider controls, why the tradeoffs matter, and three presets for real jobs.
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Photogrammetry
Image Overlap for Drone Mapping: Why 75% Isn't Always Enough
Image overlap drone mapping: 75/60 is the floor, not the target. Here's what fails when overlap is wrong and how to set photogrammetry overlap by job type.
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Software & Processing
ODM vs ODX: The April 2026 Fork, Explained for Drone Operators
In April 2026 WebODM forked the OpenDroneMap stack and renamed it — ODM became ODX, NodeODM became NodeODX. Which one you actually install, and why.
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Photogrammetry
Drone Mapping Deliverables: Formats, Exports, Client Needs
Orthomosaic export settings, point cloud formats, DEMs, coordinate systems — and how to package drone deliverables so clients can actually use them.
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Photogrammetry
Why Your Drone Map Looks Warped: The Doming Effect Explained
The drone map doming effect causes systematic elevation errors up to 13 ft — and the orthomosaic looks fine. Here's how to detect, fix, and prevent it.
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Survey Accuracy
Reading a Drone Mapping Quality Report — Pix4D & Metashape
The drone mapping quality report looks reassuring — until a client finds 8-inch errors. Learn to read every Pix4D and Metashape number before delivery.
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Consumer Drone Mapping
Flight Parameters: Overlap, Altitude & Speed for Mini Mapping
Drone mapping flight parameters: GSD, overlap, altitude, speed. 80% frontal / 70% side minimums. Accuracy improves 11x from 60% to 80% overlap.
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Survey Accuracy
Checkpoints vs Control Points in Drone Survey Accuracy
GCP residuals measure fit, not accuracy. Drone survey checkpoints provide independent validation. How to set them up in Pix4D, Metashape, WebODM.
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Technology
Photogrammetry on Linux: RealityScan, ODM & COLMAP Compared
Compare RealityScan, OpenDroneMap, Meshroom, and COLMAP for photogrammetry on Linux. Headless processing, Docker deployment, and which tool fits your workflow.
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Photogrammetry Workflow
3D Gaussian Splatting for Drone Operators, Explained
3D Gaussian Splatting for drone operators: vs photogrammetry, accuracy benchmarks, software and pricing, hybrid workflow, what it cannot do.
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Processing & Software
Why Move WebODM to the Cloud? (And When Not To)
WebODM cloud vs local: AWS spot costs ($3-5/job), egress surprises, decision framework for when cloud wins vs when your workstation is better.
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Software & Processing
OpenDroneMap Explained: WebODM, NodeODM, ClusterODM & ODX
WebODM, NodeODM, ClusterODM, and the new ODX fork — what each does in the free, open-source Pix4D alternative, and how to start mapping.
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Photogrammetry Workflow
Georeferenced NeRF vs Photogrammetry: When Each Wins
NeRF vs photogrammetry for drone mapping: accuracy numbers, output products, georeferencing limits, and a decision framework for when each wins.
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Data Processing
Processing Checklist: From Raw Images to Defensible Deliverables
Drone processing checklist: CRS setup, alignment QA, GCP integration, checkpoint validation, quality report review. Prevents accuracy failures.
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Drone Hardware
Best Consumer Drones for Mapping in 2026
Consumer drone mapping buyer's guide: DJI Mini 4 Pro vs Mini 3 Pro vs Autel Evo Nano+. Accuracy, rolling shutter, GCP needs — field-tested verdicts.
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Survey Accuracy & GCPs
Coordinate Systems for Drone Operators: CRS Mistakes to Avoid
WGS84 vs NAD83, state plane, vertical datums — the CRS settings drone operators get wrong, and how to fix them in Metashape, Pix4D, and ODM.
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Drone Mapping Fundamentals
What Is an Orthomosaic? A Practitioner's Guide
An orthomosaic is a georeferenced image mosaic built from overlapping drone photos. How photogrammetry creates one, GSD, GeoTIFF vs COG, GIS use.
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Drone Mapping Fundamentals
DSM vs DTM vs DEM: What's the Difference and Which Do You Need?
DSM vs DTM vs DEM for drone operators: definitions, how each is derived from photogrammetry, ground classification, and when each product is required.
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LiDAR & Remote Sensing
LiDAR vs Photogrammetry for Drone Mapping: Accuracy & Cost
LiDAR vs photogrammetry for drone surveys: real accuracy numbers, hardware costs, processing workflows, and a decision framework — when each technology wins, and when it doesn't.
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Featured Article
Software & Processing
WebODM Splits from OpenDroneMap (April 2026): Migration Guide
WebODM split from the OpenDroneMap nonprofit on April 6, 2026. What changed, why, and migration steps — new GitHub URLs, Docker images, docs.
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Software & Processing
WebODM vs Pix4D vs Metashape vs RealityCapture: 2026 Verdict
WebODM vs Pix4D vs Metashape vs RealityCapture: pricing, speed, accuracy, and GCP workflow compared — and which one wins for survey-grade work in 2026.
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Survey Accuracy & GCPs
Drone Survey Accuracy: RMSE, CE90, LE90, ASPRS Standards (2026)
Real drone survey accuracy in 2026: ±2–5 cm horizontal, ±3–12 cm vertical typical. RMSE vs CE90 vs LE90 explained, ASPRS classes, 5 red flags in any quality report.
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Survey Accuracy & GCPs
RTK vs PPK Drone Mapping: Which Should You Use?
RTK vs PPK for drone surveys: both hit 1-3cm accuracy. RTK corrects in real time, PPK processes post-flight. Failure modes, costs, when to use each.
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Featured Article
Survey Accuracy & GCPs
Ground Control Points for Drone Surveys: How Many, Where, and Why
How many ground control points does a drone survey need? 5 GCPs for under 5 acres, 8–12 for 50–500. Distribution beats density — and always include independent checkpoints.
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Featured Article
Software & Processing
PIX4Dmatic 2.0: What Surveyors Actually Need to Know
PIX4Dmatic 2.0 absorbs PIX4Dsurvey into three tiers. Full comparison vs Metashape and DJI Terra on price, accuracy, GCP workflows, and deliverables.
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Hardware & Equipment
The Ultimate Hardware Guide for Drone Mapping
Drone mapping hardware guide: CPU, GPU, RAM, NVMe requirements for photogrammetry. Workstation builds by project size and processing software.
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Data & Deliverables
What Is Drone Data?
Drone data explained: imagery, orthomosaics, point clouds, elevation models, 3D meshes. How photogrammetry turns photos into geospatial products.
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Getting Started
Welcome to AeroCartwright
AeroCartwright: drone mapping education and geospatial tools from a working GIS professional with firefighting, academic, and federal field experience.
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