Tree measurement method of mobile phone panoramic orthographic photography in forest plots

Abstract

The invention discloses a panoramic normal-case forest sample plot photographing mobile phone device and a tree measuring method thereof. The panoramic normal-case forest sample plot photographing mobile phone device consists of a vertical rod with two supporting sheets, an automatic rotating chassis, and two calibrated mobile phones. The tree measuring method comprises the following steps: firstly, fixing the two calibrated mobile phones on the two supporting sheets of the vertical rod respectively; secondly, under the assistance of a leveling bubble, regulating foot screws of the chassis to enable the panoramic normal-case forest sample plot photographing mobile phone device to keep level; thirdly, opening panoramic photographing modes of the mobile phones, and automatically rotating for one circle to obtain panoramic stereopair of a forest sample plot; finally, by virtue of a transformation relationship between a photogrammetric image space and a photogrammetric object space, acquiring coordinates of standing trees in the sample plot, and determining relative position relationship between the standing trees, wherein according to the transformation relationship between the image space and the object space, breast diameters and tree heights of the standing trees in the sample plot can be acquired. By the tree measuring method, panoramic mobile phone photography is applied to tree measurement in the sample plot, so that the field observation time is greatly saved, the working efficiency is improved, the labor intensity is reduced, and the permanent storage of a field investigation condition is facilitated.

Description

[0001] 1. Technical field [0002] The invention relates to a forest plot survey device and a tree measuring method thereof, in particular to a forest plot mobile phone panoramic upright photographing device and a tree survey method thereof. [0003] 2. Technical background [0004] So far, photogrammetry has been applied to the measurement of forest plots. At present, the method of photogrammetry tree measurement mainly adopts single-chip static measurement, but in the actual forestry measurement process, there are many troubles and inconveniences in single-chip static photogrammetry: [0005] ①Single-slice photogrammetry is only for the measurement of a single standing tree, but it is not practical for the entire plot; [0006] ②Single-slice photogrammetry needs to measure the plots of plots, and the single-slices need to be synthesized, and there must be a good degree of overlap between the single-slices, which increases labor intensity and reduces labor efficiency; [0007...

AI Technical Summary

Problems solved by technology

[0004] So far, photogrammetry has been applied to the measurement of forest plots. At present, the method of photogrammetry tree measurement mainly adopts single-chip static measurement, but in the actual forestry measurement process, there are many troubles and inconveniences in single-chip static photogrammetry:

[0005] ①Single-slice photogrammetry is only for the measurement of a single standing tree, but it is not practical for the entire plot;

[0006] ②Single-slice photogrammetry needs to measure the plots of plots, and the single-slices need to be synthesized, and there must be a good degree of overlap between the single-slices, which increases labor intensity and reduces labor efficiency;

[0007] ③ The image storage of single-chip photogrammetry requires a large memory, which creates certain requirements and troubles for later data archiving;

[0008] ④ It is difficult to guarantee the speed required for measurement by purely manual measurement, resulting in inaccurate measurement results and reduced efficiency

[0009] Therefore, it will inevitably bring a lot of trouble and inconvenience to use monolithic static measurement in the process of forest plot measurement

Images