Related Experiment Video
Updated: May 9, 2026
09:04
Leaf Area Index Estimation Using Three Distinct Methods in Pure Deciduous Stands
Published on: August 29, 2019
[NDVI difference rate recognition model of deciduous broad-leaved forest based on HJ-CCD remote sensing data]
Yan Wang1, Qing-Jiu Tian, Yan Huang
1International Institute for Earth System Science, Nanjing University, Nanjing 210023, China. wangyan_woshiwang@163.com
Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|July 12, 2013
Summary
This study introduces a new method using the Normalized Difference Vegetation Index (NDVI) difference rate to identify deciduous broad-leaved forests. The approach effectively maps forest distribution using remote sensing data.
Area of Science:
- Forestry science
- Remote sensing
- Geographic Information Systems (GIS)
Context:
- Accurate mapping of forest ecosystems is crucial for conservation and management.
- Deciduous broad-leaved forests are significant components of terrestrial biodiversity.
- Remote sensing technologies offer efficient tools for large-scale vegetation monitoring.
Purpose:
- To develop and validate a novel method for recognizing deciduous broad-leaved forests.
- To utilize the Normalized Difference Vegetation Index (NDVI) difference rate for forest identification.
- To apply this method to HJ-CCD satellite imagery for spatial distribution mapping.
Summary:
- A recognition model for deciduous broad-leaved forests was constructed using the NDVI difference rate between leaf expansion and flowering/fruit-bearing stages.
- The model was applied to HJ-CCD remote sensing images acquired on April 1, 2012, and May 4, 2012, in Chuzhou, Anhui Province.
- The method effectively extracted the spatial distribution of deciduous broad-leaved forests, with results verified and evaluated.
Impact:
- The study validates the efficacy of the NDVI difference rate as an extraction method for deciduous broad-leaved forests.
- It confirms the applicability of HJ-CCD data for vegetation classification and recognition.
- Provides a reliable technique for forest mapping and monitoring in regional ecological studies.
Related Concept Videos
01:05Difference from Background: Limit of Detection
The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...
The LOD indicates the presence or absence...
01:13Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview
Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
The ATR process begins by directing a beam...
01:03Precipitation Gravimetry
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
01:17Precipitation and Co-precipitation
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
01:12Differential Leveling
Differential leveling is a precise method in surveying used to determine the elevation difference between two points. Its primary goal is to establish accurate vertical measurements to create level surfaces or grade lines critical for designing and constructing infrastructures such as roads, bridges, and buildings.The procedure for differential leveling begins with setting up and leveling the instrument at a point where the benchmark can be seen. The level rod is held on the benchmark (BM), and...
02:16Light Acquisition
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.