Ancient Forest Wetlands, BC - Upper Fraser River - 2019 - Airborne Coastal Observatory

Ancient Forest Wetlands Survey conducted on Aug 29th 2019. Contained within this report
are details regarding the project specifications, overall data accuracy, and deliverables.
A survey acquisition of LiDAR and orthoimagery was carried out over Ancient
Forest/Chun T'Oh Whudujut Provincial Park to generate a high-res DEM of several wetland
complexes and their surrounding topography. The DEM is being used to support a project
mapping the hydraulic gradient throughout the year in the wetlands in an effort to determine
how significant snowmelt recharge is for these ecosystems.
Hakai Institute’s Airborne Coastal Observatory (Hakai ACO) conducted an aerial survey
of 14.95km2 approximately 93km south-east of the Prince George Airport over the Ancient
Forest / Chun T’oh Whudujut Provincial park. The survey commenced on Aug 29th 2019 and
finished on the same date. Data collected includes: LiDAR, 4 band digital imagery, and
Inertial Navigation System (INS) data
Using combined GNSS and Inertial Movement Unit (IMU) data, the Hakai geospatial
group calculated aircraft attitude and position, and incorporated laser range data to resolve
spatial surface information. The flight consisted of 8 parallel passes over the Ancient Forest/
Chun T’oh Whudujut Provincial Park and the INS positional data was processed immediately
after the completion of the project. Previous calibration flights allowed Hakai’s geospatial
group to calibrate the roll, pitch, and heading of the system and refine the acquired spatial
data.
Aircraft position data was processed using an Applanix CenterPoint RTX solution by
combining multiple continuous operating GNSS base stations to generate a set of
observations as base stations to post-process Differential GNSS processing. The aerial
survey combined with previously flown calibration flights aided in resolving and validating
vertical elevations and geo-referenced aerial photos.
Hakai Institute’s geospatial team completed all data acquisition, data post-processing and
quality analysis.

Geodetic Parameters
Horizontal Datum: NAD83 (CSRS)
Epoch: 2010.00
Vertical Datum: CGVD2013
Geoid: CGG2013a
Projection: UTM Zone 10 N
Units: Metres
Point Specification
Aggregated Nominal Point Density (ANPD): 7.3 pts/m2
Aggregated Nominal Ground Point Density (ANGPD): 2.71pts/m2
Orthophoto Resolution: 7.4 cm pixel resolution

Data products available:
Lidar data (LAZ)- classified point cloud – digital surface model – digital terrain model.
Image data (TIFF) – 4 band orthophotos – RGB & NIR.
Hyperspectral data (not always captured).
A detailed project report with the summary of acquisition, processing, and overall hardware / software is available (PDF).
Sensors and instrument breakdown:
Inertial Navigation System: Manufacturer: Applanix (Canada), IMU Model: POS AV 510 IMAR, GNSS Model: Trimble AV39.
Laser sensor: Riegl LMS-Q 780 long-range airborne laser scanner. Point density ranges per project and landscape from 1-12 points per square meter.
Aerial cameras: two fully integrated Phaseone Industrial iXU-RS1000 medium format cameras, resolution: 100MP, lens: 50mm f/4.0 Rodenstock.
Hyperspectral Sensor: manufacturer: Specim, model: AisaFENIX 384, spectral range: 380 - 2500 nm

2019年8月29日开展的古森林湿地调查。本报告涵盖了项目规格、整体数据精度与交付成果的详细信息。
本次调查于古森林/春托·伍杜贾特省立公园（Ancient Forest/Chun T'Oh Whudujut Provincial Park）区域开展了激光雷达（LiDAR）与正射影像数据采集工作，旨在生成多处湿地复合体及其周边地形的高分辨率数字高程模型（DEM）。该DEM将用于支撑一项湿地全年水力梯度测绘项目，以探明融雪补给对这些生态系统的重要性。

哈凯研究所机载海岸观测站（Hakai ACO）于乔治王子城机场东南约93公里处的古森林/春托·伍杜贾特省立公园区域开展了面积达14.95平方公里的航空测量工作，本次测量于2019年8月29日当日启动并完成。采集的数据包括：激光雷达（LiDAR）数据、4波段数字影像数据以及惯性导航系统（INS）数据。

哈凯地理空间团队结合全球导航卫星系统（GNSS）与惯性测量单元（IMU）数据，计算了飞行器的姿态与位置，并融合激光测距数据以解算空间地表信息。本次飞行共8次平行飞越古森林/春托·伍杜贾特省立公园区域，且INS位置数据在项目完成后即刻完成处理。此前的校准飞行使哈凯地理空间团队得以校准系统的滚转、俯仰与航向参数，并优化了采集到的空间数据。

飞行器位置数据采用Applanix CenterPoint RTX解决方案进行处理：通过整合多台连续运行的GNSS基准站生成观测数据集作为基准站，以开展差分GNSS后处理工作。本次航空测量结合此前开展的校准飞行，有助于解算并验证垂直高程数据与地理参考航空影像。

哈凯研究所地理空间团队完成了全部数据采集、数据后处理与质量分析工作。

### 大地测量参数
水平基准面：NAD83（CSRS）
历元：2010.00
垂直基准面：CGVD2013
大地水准面：CGG2013a
投影：UTM 10N带
单位：米

### 点位规格
聚合标称点密度（Aggregated Nominal Point Density，ANPD）：7.3点/平方米
聚合标称地面点密度（Aggregated Nominal Ground Point Density，ANGPD）：2.71点/平方米
正射影像分辨率：7.4厘米像素分辨率

### 可提供的数据产品
激光雷达（LiDAR）数据（LAZ格式）：分类点云、数字表面模型、数字地形模型
影像数据（TIFF格式）：4波段正射影像（包含RGB与近红外波段）
高光谱数据（并非每次采集均包含）
包含采集、处理及整体软硬件概要的详细项目报告（PDF格式）亦可获取。

### 传感器与仪器明细
惯性导航系统（INS）：制造商为加拿大Applanix公司，惯性测量单元（IMU）型号为POS AV 510 IMAR，GNSS型号为Trimble AV39。
激光传感器：Riegl LMS-Q780远程机载激光扫描仪。本次项目及研究区域的点密度范围为1~12点/平方米。
航空相机：两台完全集成的Phaseone Industrial iXU-RS1000中画幅相机，分辨率为100MP，镜头为50mm f/4.0 Rodenstock镜头。
高光谱传感器：制造商为Specim公司，型号为AisaFENIX 384，光谱范围为380~2500纳米。