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

Chun WANG; Yan XU; Ling JIANG; Mingwei ZHAO

doi:10.12082/dqxxkx.2020.190235

Journals >Journal of Geo-information Science >Volume 22 >Issue 3 >Page 361 > Article

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

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

Chun WANG^{1、1、2、2、*}, Yan XU^{1、1、2、2}, Ling JIANG^{1、1、2、2}, and Mingwei ZHAO^{1、1、2、2}

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

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DOI: 10.12082/dqxxkx.2020.190235 Cite this Article

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 Copy Citation Text

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Fig. 1. Schematic diagram of DEM local slope shapes

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Fig. 2. Illustration of slope with a single morphology

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

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

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

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

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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 1. Means of E_{tax_P}

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 2. Concave and convex accuracy indexes of 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

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

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

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