DB/T 75-2018 in English

VALID

Earthquake disaster assessment based on remote sensing-Building damage

Issued on:2018-12-26
Implemented on:2019-03-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $230.00
$224.00

Standard No:	DB/T 75-2018
Document status:	VALID
Title in English:	Earthquake disaster assessment based on remote sensing-Building damage
Title in Chinese:	地震灾害遥感评估建筑物破坏
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2018-12-26
Implemented on:	2019-03-01
Professional Classification:	DB-Provincial Standard
Related Keywords:	earthquake damage earthquake disaster assessment earthquake evaluation accuracy area remote sensing-building damage introduction analysis different earthquake magnitudes
Related Topics:	remote sensing disaster remote sensing standards remote sensing standards destroy remote sensing telemetry Geography and Remote Sensing remote sensing assessment earthquake area earthquake area Telemetry and remote sensing Destroy substances break drug destruction desire to destroy Classification of Earthquake Damage of Buildings (Structures) GBT75-2018 Earthquake Disaster Risk Assessment Technology Flood and Drought Disaster Remote Sensing Monitoring and Assessment Technology Construction of low-altitude remote sensing network

Introduction

Analysis of the core content of the standard

Evaluation dimensions	Single building	Group of buildings
Damage category	Collapsed/partially collapsed/not collapsed	Dense collapse/sparse collapse/no collapse
Resolution requirement	0.2m is required for a magnitude 6 earthquake, 0.5m is required for a magnitude 8 earthquake
Evaluation accuracy	Area and number of floors must be marked	Evaluation by block/natural village unit

Key Points of Technical Implementation

Using Gaofen-7 satellite imagery as an example, for masonry structures: complete collapse manifests as a loss of outline and fragmented texture; partial collapse manifests as a broken roofline with surrounding debris accumulation; uncollapsed buildings maintain their complete geometric form.

Special attention should be paid to industrial plant assessments: distortion of steel structures manifests as irregularly extended shadows in remote sensing images, in stark contrast to the parallel shadows of normal bent structures.

Background of Standard Evolution

This standard makes a breakthrough in linking the GB/T24335-2009 field investigation standard with remote sensing features. Innovations include:

Establishing a correspondence between Level 5 earthquake damage and Level 3 remote sensing features
For the first time, stipulating the minimum resolution threshold for different earthquake magnitudes
Introducing a quantitative indicator of damage density (critical values such as 40%/10%)

Application Implementation Suggestions

Prioritize the use of multi-temporal image comparison technology. It is recommended to reserve a 0.5m resolution base map for key areas before an earthquake
For UAV aerial photography data, special attention should be paid to image geometric distortion correction
The assessment results should be verified with on-site sampling, and interpretation areas with an error rate greater than 15% should be corrected.

More samples: DL/T 368-2010 YD/T 3934-2021 JC/T 2453-2018

Sample only — not a preview of DB/T 75-2018