HJ 1098-2020 in English

VALID

Technical specifications for monitoring and evaluating algal bloom based on remote sensing and field monitoring

Issued on:2020-02-12
Implemented on:2020-04-12
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $250.00
$243.00

Standard No:	HJ 1098-2020
Document status:	VALID
Title in English:	Technical specifications for monitoring and evaluating algal bloom based on remote sensing and field monitoring
Title in Chinese:	水华遥感与地面监测评价技术规范（试行）
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-02-12
Implemented on:	2020-04-12
Professional Classification:	HJ-Environment
Related Keywords:	monitoring ground monitoring core indicators proportion algal bloom algal bloom area field monitoring introduction analysis % strengthen monitoring +
Related Topics:	Monitoring and evaluation remote sensing Remote sensing monitoring basis bloom remote sensing standards remote sensing standards Remote sensing monitoring data Remote sensing monitoring data Radiation Monitoring and Evaluation Bloom+ magnificent foreign remote sensing technology Remote Sensing Technology and Application remote sensing telemetry remote Geography and Remote Sensing Monitoring and evaluation Hua+ 6 ground monitoring items 6 underground monitoring items Telemetry and remote sensing Telemetry and remote sensing post-evaluation monitoring Water bloom monitoring Analysis and Evaluation of Flour Process monitoring and evaluation Motor Vehicle Remote Sensing Monitoring Tea Garden Remote Sensing Monitoring Technology Soil and Water Conservation Remote Sensing Monitoring Technology Water quality remote sensing monitoring technology Remote sensing water industry Urban carbon sink remote sensing evaluation technology Flood and Drought Disaster Remote Sensing Monitoring and Assessment Technology Remote sensing monitoring technology for facility agricultural land Ground pressure monitoring specifications my country's remote sensing monitoring Remote sensing calibration technology American remote sensing technology Remote Sensing Specifications Algae bloom evaluation Geographical environment remote sensing monitoring technology What are the remote sensing monitoring standards?

本标准规定了淡水水体蓝藻水华遥感监测方法、地面监测方法和水华程度评价方法等内容。甲藻、硅藻及其他藻类水华监测与评价可参考使用本标准。
本标准适用于我国淡水
湖库水华监测、评价与管理。其他淡水水体的水华监测与评价可参考使用本标准。

Introduction

Analysis of the core content of the standard

Technical dimension	Remote sensing monitoring	Ground monitoring
Core indicators	Proportion of algal bloom area (NDVI threshold segmentation)	Algae density (microscope/portable instrument)
Spatial coverage	Macro-monitoring of the entire basin	Micro-monitoring of representative points
Temporal resolution	Daily (ideal state)	Weekly/monthly (by monitoring type)

Key Technological Breakthroughs

The standard innovatively proposes a three-level NDVI calculation system:

NDVIDN: Calculated based on the original grayscale value, the threshold needs to be dynamically adjusted
NDVITOA: Calculation of top of atmosphere reflectivity, improved stability
NDVIBOA: Calculation of surface reflectivity, the threshold is fixed at 0 (optimal solution)

Taihu Lake Application Case

Monitoring in August 2021 showed that when NDVIBOA>0.12, the on-site verified algal bloom identification accuracy reached 92%, an increase of 30% over the traditional method

Five-level evaluation system for algal blooms

Level	Algae density (individuals/L)	Area ratio	Management measures
Level V	≥1×10⁸	≥60%	Emergency algae control + water source warning
Level IV	5×10⁷-1×10⁸	30%-60%	Strengthen monitoring + ecological scheduling

Implementation suggestions

Equipment selection: Prioritize multispectral sensors in the red (630-690nm) and near-infrared (760-900nm) bands
Threshold optimization: Establish a localized NDVI threshold library, and calibrate it every quarter.
Quality control points: Geometric correction accuracy ≤ 1 pixel, algal bloom identification verification samples ≥ 20%

More samples: GB 18306-2015 GB 50021-2001(2009) JJG 21-2008

Sample only — not a preview of HJ 1098-2020

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