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Category «Blog Posts»

The Cost of Bad Control: Real-World Scenarios Where Weak GCPs Caused Costly Re-Flights

Fixing GCP Errors in Photogrammetry

GCP errors in photogrammetry often stem from misidentified targets, unreliable field measurements, incorrect coordinate settings, or weak control-point distribution. These issues can distort a reconstruction, reduce positional accuracy, and create uncertainty in orthomosaics, point clouds, and terrain models used for engineering and UAS mapping. CompassData helps reduce that uncertainty with field-validated Ground Control Points, or …

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Renewable Energy Siting: Ensuring Vertical Precision in Solar and Wind Terrain Modeling

Ground Control for Solar Farm Mapping

Accurate ground control is the foundation of dependable solar farm mapping. Survey-grade Ground Control Points, or GCPs, help ensure that aerial imagery, orthophotos, terrain models, and LiDAR data align with real-world coordinates, giving renewable energy teams a reliable basis for site assessment, design, earthwork planning, and construction monitoring. CompassData collects and validates GCPs using high-precision …

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High-Accuracy Ground Control for Utility and Transmission Corridor Mobile Mapping

Corridor Mapping Ground Control: Mobile GCP Solutions

Ground Control Points, or GCPs, anchor corridor and mobile mapping workflows to a verified coordinate reference system. They help correct positional drift along long, narrow routes such as roads, railways, pipelines, rivers, and transmission corridors, where even small errors can accumulate over miles of data collection. CompassData provides professionally surveyed GCPs for utility, infrastructure, mobile …

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Port and Maritime Infrastructure Mapping: Managing Tidal Datums and Coastal Geodetic Control

Coastal Mapping Ground Control for Maritime Infrastructure

Ground control points anchor coastal mapping to verified, survey-grade accuracy by connecting shoreline, infrastructure, and bathymetric data to a consistent real-world reference frame. For projects affected by changing water levels, that reference must also relate appropriately to the local tidal datum used for navigation, hydrography, engineering, and coastal management. CompassData collects Ground Control Points, or …

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Airport Mapping & AMDB: Meeting FAA DO-200 Standards for Aeronautical Data

An aerodrome survey captures precise geospatial data for all airport infrastructure including runways, taxiways

Airport mapping accuracy standards demand survey-grade Ground Control Points, or GCPs, validated through rigorous field and quality-control processes. CompassData collects GCPs using dual-frequency GPS and GNSS receivers, total stations, and survey methods such as static, rapid-static, and real-time kinematic, or RTK, techniques selected for aerodrome conditions. This field-proven methodology supports airport GIS, engineering, aerodrome mapping, …

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Defensible Data: Why Independent QA/QC Matters in Legal and Regulatory Mapping

ASPRS accuracy compliance ensures that geospatial data meets industry-standard positional tolerances

Independent geospatial accuracy verification confirms whether mapping and survey data meet their stated positional standards through a qualified third-party audit. When a project depends on the exact location of a boundary, utility asset, roadway feature, or elevation surface, “close enough” is not enough. Every coordinate must be able to withstand technical review, regulatory scrutiny, and …

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GCP Archive vs. New Collect: Choosing the Right Ground Control Strategy

Buying from a GCP archive is cost-effective for projects where existing points meet accuracy requirements

Archive GCPs are well suited to budget-conscious projects that need a fast turnaround, while new collection delivers site-specific accuracy through CompassData’s field-proven process. New collections use dual-frequency GPS and GNSS receivers, total stations, and methods such as static, rapid-static, and RTK surveys. Each point is cross-checked and validated, making new collection an ideal choice when …

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Aurora Water Transmission and Distribution GIS Updates Project

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Case Study: How Mobile Mapping Helped Aurora Water Map 160+ Intersections Safely and Under Budget Utility departments face a hard tradeoff every time they need to survey underground infrastructure in a busy intersection: send crews into live traffic to get accurate data, or accept gaps in the GIS record. Aurora Water’s Transmission and Distribution GIS …

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Puerto Rico Launches Mobile Mapping Initiative for Disaster Resilience

Mobile Mapping for Disaster Resilience: What Puerto Rico’s $7.2M Initiative Tells Us About the Future of Geospatial Data When a hurricane, flood, or wildfire hits, the agencies coordinating the response are only as fast and as accurate as the data underneath them. That’s the thinking behind a major new mobile mapping initiative just announced in …

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