Utikuma Region Alberta lidar canopy height model time series

The dataset includes 6 x 5 m resolution raster canopy height models derived from multiple return airborne laser scanning (ALS) datasets (all sampled at >1pt / m2) collected during the growing seasons of 2002, 2008, 2011 (pre-fire), 2016, 2018, and 2019 (post-fire). Some areas have undergone shorter fire return interval as fire burned part of the area in 1956, 2011, and in both 1956 and 2011.

ALS data sources:
2002 collected by Optech Inc. (Toronto, Ont.) using an airborne laser terrain mapper (ALTM) 2050 as part of the HEAD project (University of Alberta, University of Western Ontario)
2008 collected by Airborne Imaging Inc. (Calgary, AB) with an Optech Inc. ALTM 3100 and licensed to the Government of Alberta.
2011 collected using an Optech Inc. ALTM 3100 by AGRG and C-CLEAR (Nova Scotia Community College)
2016, 2018, 2019 collected using a Teledyne Optech Inc. Titan multi-spectral lidar by the ARTeMiS Lab, University of Lethbridge.

All data share a common spatial reference frame and datum (UTM WGS84, zone 11N). Elevations are given in ellipsoidal height.

Canopy height models were derived based on the maximum height within 1 m x 1 m cells, subtracted from the ground digital elevation model. These were resampled to 5 m x 5 m cells to reduce the influence of lower return densities found in older datasets and thus improve the accuracy of time-based comparisons.

For more information on the raw datasets and associated time series analysis, see:
Jones, Chasmer, Devito, Hopkinson, 2024. Shortening fire return interval predisposes west-central boreal peatlands to more rapid vegetation growth and transition to forest cover. Global Change Biology.

本数据集包含由多源机载激光扫描（ALS）数据集（所有数据均以大于1点/平方米的密度采样）于2002年、2008年、2011年（火灾前）、2016年、2018年和2019年（火灾后）生长季节获取的6 x 5米分辨率的栅格冠层高度模型。部分区域因1956年、2011年以及1956年和2011年火灾导致的部分区域被焚毁，而经历了较短的火灾回归周期。ALS数据来源包括：2002年由Optech Inc.（安大略省多伦多）使用机载激光地形测绘仪（ALTM）2050作为HEAD项目（阿尔伯塔大学，西安大略大学）的一部分进行采集；2008年由Airborne Imaging Inc.（艾伯塔省卡尔加里）使用Optech Inc. ALTM 3100采集，并授权给艾伯塔省政府；2011年由AGRG和C-CLEAR（新斯科舍省社区学院）使用Optech Inc. ALTM 3100采集；2016年、2018年、2019年由Lethbridge大学的ARTeMiS实验室使用Teledyne Optech Inc. Titan多光谱激光雷达采集。所有数据均共享一个共同的地理参考框架和基准（UTM WGS84，11N区）。高度以椭球面高度给出。冠层高度模型是基于1米x1米单元格内的最大高度，从地面数字高程模型中减去得到的，这些模型被重采样至5米x5米单元格，以减少旧数据集中发现的低返回密度的影响，从而提高基于时间比较的准确性。有关原始数据集及其相关的时间序列分析信息，请参阅：Jones, Chasmer, Devito, Hopkinson, 2024. 火灾回归周期缩短使中西部的北方泥炭地更容易发生快速植被生长并向森林覆盖过渡。全球变化生物学。