<trans-title>Accuracy Assessment of Local Slope Concave-convex Properties based on Multi-scale Gridded DEMs</trans-title>

Chun WANG; Yan XU; Ling JIANG; Mingwei ZHAO

doi:10.12082/dqxxkx.2020.190235

Journal of Geo-information Science, Volume. 22, Issue 3, 361(2020)

Accuracy Assessment of Local Slope Concave-convex Properties based on Multi-scale Gridded DEMs

Chun WANG1...1,2,2,*, Yan XU1,1,2,2, Ling JIANG1,1,2,2, and Mingwei ZHAO1,1,22 |Show fewer author(s)

Author Affiliations

¹Geographic Information and Tourism College ,Chuzhou University, Chuzhou 239000, China

¹滁州学院地理信息与旅游学院,滁州 239000

²Anhui Engineering Laboratory of Geo-information Smart Sensing and Services, Chuzhou 239000, China

²安徽省地理信息智能感知与服务工程实验室,滁州 239000

show less

Abstract Get PDF(in Chinese)

Figures & Tables(9)

Fig. 1. Schematic diagram of DEM local slope shapes

Download full size

View in Article

Fig. 2. Illustration of slope with a single morphology

Download full size

View in Article

Fig. 3. Hillshade of 5 m DEM in test area

Download full size

View in Article

Fig. 4. Spatial distribution of contour register differences under different DEM cell sizes

Download full size

View in Article

Fig. 5. Spatial distribution of concave and convex accuracy indexes of DEM local slope shapes

Download full size

View in Article

Fig. 6. Spatial distribution of maximum and minimum of elevation numerical error

Download full size

View in Article

Table 1. Means of E_{tax_P}

View table

View in Article

Table 1. Means of E_{tax_P}

E_{tax_P}值	代表含义
2	局地坡面形态由原来的凹形坡面变为凸形坡面
1	局地坡面形态由原来的凹形坡面变成平直坡面,或由原来的平直坡面变成凸形坡面
0	局地坡面形态没有变化
-1	局地坡面形态由原来的凸形坡面变成平直坡面,或由原来的平直坡面变成凹形坡面
-2	局地坡面形态由原来的凸形坡面变为凹形坡面

Table 2. Concave and convex accuracy indexes of local slope shapes

View table

View in Article

Table 2. Concave and convex accuracy indexes of local slope shapes

序号	指标名称	计算公式	指标含义	公式编号
1	算数平均值	$E_{\overset{̅}{x}} = \frac{\overset{n}{\sum_{i = 1}} E_{tax_i}}{n}$	所有检测点凸凹性误差的平均值。主要反映与局地坡面形态凸凹性误差是否存在系统规律。E_{tax_i}含义见表1,n为总检测点个数	（3）
2	正确率值	$E_{x_0} = \frac{k_{0}}{n} \times 100$	k₀是所有检测点中凸凹性未发生改变的坡面个数,n为总检测点个数	（4）
3	渐变率值	$E_{x_1} = \frac{k_{1}}{n} \times 100$	k₁是所有检测点中按照“凸平凹或凹平凸”次序,发生凸变平、平变凹、凹变平或平变凸等变化的坡面个数,n为总检测点个数	（5）
4	跃变率值	$E_{x_2} = \frac{k_{2}}{n} \times 100$	k₂是所有检测点中从“凸平凹或凹平凸”次序,发生凸变凹或凹变凸变化的坡面个数,n为总检测点个数	（6）

Table 3. Concave and convex accuracy indexes of DEM local slope shapes

View table

View in Article

Table 3. Concave and convex accuracy indexes of DEM local slope shapes

DEM格网分辨率/m	正确率/%	渐变率/%			跃变率/%
DEM格网分辨率/m	正确率/%	凹变平或平变凸	凸变平或平变凹	合计	凹变凸	凸变凹	合计
10	96.81±0.0236	1.55±0.0119	1.50±0.0178	3.05±0.0222	0.08±0.0019	0.07±0.0024	0.14±0.0033
15	94.66±0.0192	2.37±0.0169	2.22±0.0165	4.58±0.0222	0.38±0.0077	0.38±0.0079	0.76±0.0090
25	90.88±0.0263	3.09±0.0211	2.84±0.0308	5.93±0.0248	1.59±0.0177	1.50±0.0185	2.98±0.0206
35	87.41±0.0367	3.41±0.0257	3.12±0.0218	6.53±0.0313	3.14±0.0173	2.92±0.0215	6.06±0.0216
45	83.42±0.0600	3.58±0.0218	3.29±0.0255	6.87±0.0275	5.07±0.0281	4.65±0.0392	9.72±0.0563
55	79.42±0.0986	3.59±0.0259	3.35±0.0272	6.94±0.0314	7.08±0.0401	6.56±0.0937	13.63±0.1027
65	75.43±0.1292	3.61±0.0317	3.41±0.0298	7.02±0.0378	9.08±0.0557	8.47±0.1200	17.55±0.1151
75	71.96±0.1499	3.56±0.0235	3.42±0.0197	6.99±0.0333	10.85±0.0976	10.20±0.0613	21.05±0.1409
85	70.14±0.1951	3.63±0.0413	3.50±0.0383	7.12±0.0547	11.67±0.1313	11.07±0.0563	22.74±0.1696
95	68.62±0.1023	3.78±0.0464	3.62±0.0264	7.40±0.0426	12.22±0.0958	11.76±0.0690	23.98±0.1183
105	66.18±0.1775	3.86±0.0386	3.70±0.0305	7.56±0.0427	13.36±0.1314	12.89±0.1080	26.26±0.1451
115	65.57±0.1695	4.19±0.0478	3.99±0.0495	8.18±0.0527	13.28±0.1289	12.97±0.0820	26.25±0.1567
125	64.68±0.3153	4.72±0.0789	4.48±0.0634	9.20±0.1017	13.15±0.2207	12.98±0.1479	26.12±0.2512
135	61.91±0.3243	4.58±0.0507	4.41±0.0509	8.99±0.0763	14.73±0.2135	14.38±0.1222	29.11±0.2769
145	61.05±0.2989	5.17±0.0954	4.94±0.1247	10.11±0.2015	14.52±0.1501	14.33±0.1521	28.85±0.2212
155	59.29±0.5449	5.44±0.1399	5.22±0.1362	10.65±0.2680	15.17±0.2515	14.88±0.1730	30.05±0.3604

Tools

Get Citation

Copy Citation Text

Chun WANG, Yan XU, Ling JIANG, Mingwei ZHAO. Accuracy Assessment of Local Slope Concave-convex Properties based on Multi-scale Gridded DEMs[J]. Journal of Geo-information Science, 2020, 22(3): 361

Download Citation

EndNote(RIS)BibTex Plain Text

Set citation alerts for article

Save article for my favorites