CN103162676B - A kind of angle gauge measures the accurate estimation method of the accumulation of forest bottom class and biomass - Google Patents
A kind of angle gauge measures the accurate estimation method of the accumulation of forest bottom class and biomass Download PDFInfo
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- CN103162676B CN103162676B CN201310122016.5A CN201310122016A CN103162676B CN 103162676 B CN103162676 B CN 103162676B CN 201310122016 A CN201310122016 A CN 201310122016A CN 103162676 B CN103162676 B CN 103162676B
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Abstract
The invention discloses the accurate estimation method that a kind of angle gauge measures the accumulation of forest bottom class and biomass, according to the size of subcompartment area, utilize actual measurement 2-5 angle gauge point angle gauge count value, 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 estimated and biomass.Greatly reduce the field process amount of forest survey, simultaneously the error in measurement brought of the selection differences of the position of angle gauge point.
Description
One, technical field
The present invention relates to the accurate estimation method that a kind of angle gauge measures the accumulation of forest bottom class and biomass, particularly utilize the 2-5 angle gauge point count value of actual measurement, estimate method by least square, utilize unknown angle gauge point to estimate to the distance of known angle gauge point the method drawing 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 forestry generally adopts, but in field investigation actual mechanical process, still there are the following problems.
1. the number of pair angle gauge observation station requires many.In China's Forestry Investigation code, according to standing forest area, clear stipulaties, determines that angle gauge is counted, as shown in table 1.If sampling precision requires that reaching more than 90% is require much 36 angle gauge points.Angle gauge point requirement is too much, and must increase field process amount, work efficiency reduces greatly.
The determination that table 1 Stand investigation angle gauge is counted
2. require that the position of each angle gauge point will be selected the representational position of standing forest, avoid arranging angle gauge point at excessively thin or overstocked place.This working experience to 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 the experience difference of operator can cause measuring error.
Therefore, the present invention is according to the size of standing forest area, by surveying the count value of 2-5 angle gauge point, estimate the count value of 5-36 angle gauge point, then actual measurement angle gauge point count value and the count value estimating angle gauge point is utilized, realize the accurate calculation of management volume and biomass, field process amount can be greatly reduced, avoid the error in measurement that the selection differences of the position of angle gauge point brings simultaneously.
Three, summary of the invention
Require many for overcoming classic method angle gauge point number, 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.Invent the accurate estimation method that a kind of angle gauge measures the accumulation of forest bottom class and biomass.It is characterized in that: according to the size of subcompartment area, utilize actual measurement 2-5 angle gauge point angle gauge count value, 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 estimated and biomass.The determination that angle gauge is counted, when subcompartment area is less than 1 hectare, angle gauge point numerical digit is 2, and when subcompartment area is less than 5 hectares, it is 3 that angle gauge is counted, and when subcompartment area is less than 10 hectares, it is 4 that angle gauge is counted, and when subcompartment area is greater than 10 hectares, it is 5 that angle gauge is counted.In block, select n angle gauge point immediately, carry out angle gauge counting, be denoted as
utilize digital-to-analogue (1)
According to the angle gauge count value of n angle gauge point of actual measurement
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)
Try to achieve;
by digital-to-analogue (4)
Try to achieve.In digital-to-analogue (3),
be i-th bevel protractor point to the distance of jth between bevel protractor point.In digital-to-analogue (4),
be i-th bevel protractor point to estimate distance between angle gauge point to jth.According to the count value of n the angle gauge point surveyed
estimate the count value of r angle gauge point
utilize digital-to-analogue (5)
obtain standing forest angle gauge count value, then calculate forest subcompartment's stock volume and biomass according to classic method further.
This invention has the following advantages compared with the conventional method:
(1) survey angle gauge to count and to reduce to 2-5 by traditional 5-36, the field process amount of the forest survey greatly reduced, improves work efficiency.
(2) error in measurement that the selection differences avoiding the position of angle gauge point brings.
Four, accompanying drawing explanation
Below in conjunction with accompanying drawing and example, the present invention is further described.
Fig. 1 is principle of the invention figure.
Five, embodiment:
In block, select n angle gauge point immediately, carry out angle gauge counting, be denoted as
utilize digital-to-analogue (1)
According to the angle gauge count value of n angle gauge point of actual measurement
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)
Try to achieve;
by digital-to-analogue (4)
Try to achieve.In digital-to-analogue (3),
be i-th bevel protractor point to the distance of jth between bevel protractor point.In digital-to-analogue (4),
be i-th bevel protractor point to estimate distance between angle gauge point to jth.According to the count value of n the angle gauge point surveyed
estimate the count value of r angle gauge point
utilize digital-to-analogue (5)
obtain standing forest angle gauge count value, then calculate forest subcompartment's stock volume and biomass according to classic method further.
Above-mentioned data processing is completed by PDA (PersonalDigitalAssistant, personal electric assistant), realizes quick storage and the process automatically of data.
Claims (3)
1. angle gauge measures an accurate estimation method for the accumulation of forest bottom class and biomass, it is characterized in that: according to the size of subcompartment area, utilizes actual measurement 2-5 angle gauge point angle gauge count value, selects n angle gauge point immediately, carry out angle gauge counting, be denoted as in block
utilize digital-to-analogue (1)
According to the angle gauge count value of n angle gauge point of actual measurement
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)
try to achieve;
by digital-to-analogue (4)
try to achieve; In digital-to-analogue (3),
be i-th bevel protractor point to the distance of jth between bevel protractor point; In digital-to-analogue (4),
be i-th bevel protractor point to estimate distance between angle gauge point to jth.
2. the accurate estimation method of the accumulation of forest bottom class and biomass is measured according to claim 1 angle gauge, it is characterized in that: the determination that angle gauge is counted: when subcompartment area is less than 1 hectare, angle gauge point numerical digit is 2, when subcompartment area is less than 5 hectares, it is 3 that angle gauge is counted, and when subcompartment area is less than 10 hectares, it is 4 that angle gauge is counted, when subcompartment area is greater than 10 hectares, it is 5 that angle gauge is counted.
3. measure the accurate estimation method of the accumulation of forest bottom class and biomass according to claim 1 angle gauge, it is characterized in that: according to the count value of n the angle gauge point surveyed
estimate the count value of r angle gauge point
utilize digital-to-analogue (5)
obtain standing forest angle gauge count value, then calculate forest subcompartment's stock volume and biomass according to classic method further.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310122016.5A CN103162676B (en) | 2013-04-10 | 2013-04-10 | A kind of angle gauge measures the accurate estimation method of the accumulation of forest bottom class and biomass |
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| CN201310122016.5A CN103162676B (en) | 2013-04-10 | 2013-04-10 | A kind of angle gauge measures the accurate estimation method of the accumulation of forest bottom class and biomass |
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| CN103162676A CN103162676A (en) | 2013-06-19 |
| CN103162676B true CN103162676B (en) | 2015-11-25 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105117374A (en) * | 2015-08-14 | 2015-12-02 | 北京林业大学 | Technical method for measuring stand with angle gauge sequential method |
| CN105138831A (en) * | 2015-08-14 | 2015-12-09 | 北京林业大学 | Method of evaluation technique for determining forest loss of burned forest area by utilizing angle gauge method |
| CN107462224A (en) * | 2016-06-03 | 2017-12-12 | 北京林业大学 | A kind of method of regular handset with arbitrarily photographing the fan-shaped sample of measure stand |
| CN108764583B (en) * | 2018-06-06 | 2021-09-28 | 浙江农林大学 | Unbiased prediction method for forest accumulation |
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2013
- 2013-04-10 CN CN201310122016.5A patent/CN103162676B/en active Active
Non-Patent Citations (3)
| Title |
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| 森林资源二类调查方法的改进及监测体系研究;林国忠;《农业科技辑》;20100601;61-65 * |
| 蓄积量角规测树;周广德;《吉林林业科技》;19790630;全文 * |
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