CN103162676A - Accurate estimation method for measuring forest sub compartment accumulation and biomass by utilizing angle gauge - Google Patents

Abstract

The invention discloses an accurate estimation method for measuring forest sub compartment accumulation and biomass by utilizing an angle gauge. The accurate estimation method disclosed by the invention comprises the following steps of: estimating other angle gauge point count values by utilizing 2-5 actual measurement angle gauge point count values according to the area of a forest sub compartment, and then estimating forest sub compartment accumulation and biomass according to the actual measured angle gauge count values and the estimated angle gauge point count values. By adopting the accurate estimation method disclosed by the invention, field workload of forest investigation is greatly reduced, and measurement error caused by selection difference of positions of angle gauge points is also greatly reduced.

Description

A kind of angle gauge measures that forest bottom class accumulates and the method that precisely estimates of biomass

One, technical field

The present invention relates to a kind of angle gauge and measure that forest bottom class accumulates and the method that precisely estimates of biomass, particularly utilize the 2-5 angle gauge point count value of actual measurement, estimate method by least square, the distance of utilizing unknown angle gauge to put known angle gauge point estimates the method that draws 5-36 angle points count value.

Two, technical background

Up to the present, angle gauge is still a kind of standing forest Fast Measurement instrument that generally adopts in forestry, but in the field investigation actual mechanical process, still there are the following problems.

1. require many to the number of angle gauge observation station.In China's Forestry Investigation rules, clear determines that according to the standing forest area angle gauge counts, and is as shown in table 1.If it is to require much 36 angle gauge points that sampling precision requires to reach more than 90%.Angle gauge is counted and is required too much must increase the field process amount, and work efficiency reduces greatly.

What table 1 Stand investigation angle gauge was counted determines

2. require the position of each angle gauge point will select the representational position of standing forest, avoid at excessively thin or overstocked place, the angle gauge point being set.This working experience to the field operation investigator requires high, and the investigator of different operating experience is large to the otherness of the selection of angle gauge point, and operator's experience difference can cause measuring error.

Therefore, the present invention is according to the size of standing forest area, count value by 2-5 angle gauge point of actual measurement, estimate the count value of 5-36 angle gauge point, then utilize actual measurement angle gauge point count value and the count value that estimates angle gauge point, realize that forest accumulates the accurate calculation with biomass, can greatly reduce the field process amount, the error in measurement of avoiding simultaneously the selection differences of the position of angle gauge point to bring.

Three, summary of the invention

Many for overcoming the requirement of classic method angle gauge point number, the field process amount is large; The selection of angle gauge point requires harsh, the error in measurement that the selection differences of the position of angle gauge point brings.Invented a kind of angle gauge and measured that forest bottom class accumulates and the method that precisely estimates of biomass.It is characterized in that: according to the size of bottom class's area, utilize 2-5 angle gauge point angle gauge count value of actual measurement, estimate other angle gauge point count value, then according to actual measurement angle gauge count value and the angle gauge point count value estimation bottom class's forest reserves and the biomass that estimate.What angle gauge was counted determines, bottom class's area is during less than 1 hectare, and angle gauge point numerical digit is 2, and bottom class's area is during less than 5 hectares, and it is 3 that angle gauge is counted, and bottom class's area is during less than 10 hectares, and it is 4 that angle gauge is counted, and bottom class's area is during greater than 10 hectares, and it is 5 that angle gauge is counted.Select immediately n angle gauge point in block, carry out the angle gauge counting, be denoted as

Utilize digital-to-analogue (1)

Angle gauge count value according to n the angle gauge point of surveying

Estimate out the count value of r angle gauge point, be denoted as

In digital-to-analogue (1),

According to digital-to-analogue (2)

Try to achieve;

By digital-to-analogue (3) $m_{p_i{p}_j}=c_o{e}^{{-k}^2{d}_{p_i{p}_j}^2}$ Try to achieve;

By digital-to-analogue (4) $m_{p_i{q}_j}=c_o{e}^{{-k}^2{d}_{p_i{q}_j}^2}$ Try to achieve.In digital-to-analogue (3), Be i bevel protractor o'clock to j the distance between bevel protractor point.In digital-to-analogue (4),

Be i bevel protractor o'clock to j estimate angle gauge point between distance.Count value according to the n that has surveyed an angle gauge point

Estimate the count value of r angle gauge point

Utilize digital-to-analogue (5)

Obtain standing forest angle gauge count value, then further calculate forest bottom class's accumulation and biomass according to classic method.

This invention is compared with existing method and is had the following advantages:

(1) the actual measurement angle gauge is counted and is reduced to 2-5 by traditional 5-36 is individual, and the field process amount of the forest survey that greatly reduces has improved work efficiency.

(2) error in measurement of having avoided the selection differences of the position of angle gauge point to bring.

Four, description of drawings

The present invention is further described below in conjunction with accompanying drawing and example.

Fig. 1 is principle of the invention figure.

Five, embodiment:

Select immediately n angle gauge point in block, carry out the angle gauge counting, be denoted as

Utilize digital-to-analogue (1)

Angle gauge count value according to n the angle gauge point of surveying

Estimate out the count value of r angle gauge point, be denoted as

In digital-to-analogue (1),

According to digital-to-analogue (2)

Try to achieve;

By digital-to-analogue (3) $m_{p_i{p}_j}=c_o{e}^{{-k}^2{d}_{p_i{p}_j}^2}$ Try to achieve;

By digital-to-analogue (4) $m_{p_i{q}_j}=c_o{e}^{{-k}^2{d}_{p_i{q}_j}^2}$ Try to achieve.In digital-to-analogue (3),

Be i bevel protractor o'clock to j the distance between bevel protractor point.In digital-to-analogue (4),

Be i bevel protractor o'clock to j estimate angle gauge point between distance.Count value according to the n that has surveyed an angle gauge point Estimate the count value of r angle gauge point

Utilize digital-to-analogue (5)

Obtain standing forest angle gauge count value, then further calculate forest bottom class's accumulation and biomass according to classic method.

Above-mentioned data are processed and are completed by PDA (Personal Digital Assistant, personal electric assistant), realize the quick storage of data and automatically process.

Claims (4)

1. an angle gauge measures that forest bottom class accumulates and the method that precisely estimates of biomass, it is characterized in that: according to the size of bottom class's area, utilize 2-5 angle gauge point angle gauge count value of actual measurement, estimate other angle gauge point count value, then according to actual measurement angle gauge count value and the angle gauge point count value estimation bottom class's forest reserves and the biomass that estimate.

2. a kind of angle gauge measures that forest bottom class accumulates and the method that precisely estimates of biomass according to claim 1, it is characterized in that: what angle gauge was counted determines: bottom class's area is during less than 1 hectare, angle gauge point numerical digit is 2, bottom class's area is during less than 5 hectares, it is 3 that angle gauge is counted, and bottom class's area is during less than 10 hectares, and it is 4 that angle gauge is counted, bottom class's area is during greater than 10 hectares, and it is 5 that angle gauge is counted.

3. a kind of angle gauge measures that forest bottom class accumulates and the method that precisely estimates of biomass according to claim 1, it is characterized in that: select immediately n angle gauge point in block, carry out angle gauge and count, be denoted as

Utilize digital-to-analogue (1)

Angle gauge count value according to n the angle gauge point of surveying

Estimate out the count value of r angle gauge point, be denoted as

In digital-to-analogue (1),

According to digital-to-analogue (2) Try to achieve;

By digital-to-analogue (3) $m_{p_i{p}_j}=c_o{e}^{{-k}^2{d}_{p_i{p}_j}^2}$ Try to achieve;

By digital-to-analogue (4) $m_{p_i{q}_j}=c_o{e}^{{-k}^2{d}_{p_i{q}_j}^2}$ Try to achieve.In digital-to-analogue (3),

Be i bevel protractor o'clock to j the distance between bevel protractor point.In digital-to-analogue (4), Be i bevel protractor o'clock to j estimate angle gauge point between distance.

4. a kind of angle gauge measures that forest bottom class accumulates and the method that precisely estimates of biomass according to claim 1, it is characterized in that: the count value of n the angle gauge point that the root pick has been surveyed

Estimate the count value of r angle gauge point

Utilize digital-to-analogue (5)

Obtain standing forest angle gauge count value, then further calculate forest bottom class's accumulation and biomass according to classic method.

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