Accuracy assessment of ALOS AW3D30 DSM and comparison to ALOS PRISM DSM created with classical photogrammetric techniques

Figures & data

Table 1. The number of check points that were used in each study area.

	Area in square km	1^st order	2^nd order	3^rd order	4^th order	Total no of check points per area
Chalkidiki Peninsula	1372,93	0	2	30	113	145
Antiparos	83,02	1	0	4	6	11
Myconos	1049,25	1	0	11	29	41
Figalia	1900,90	1	3	24	161	189
Thessaloniki	1378,44	0	2	37	144	183
Attiki	1837,15	0	4	28	170	202
Attiki 2	736,00	1	3	13	66	83
Attiki 3	935,92	0	4	15	55	74
North Chania	962,00	1	4	8	91	104
South Chania	913,90	0	2	15	91	108
Total		5	24	185	926	1140

Figure 1. Greece and allocation of the ten ALOS PRISM triplets.

Figure 2. An example of the ALOS PRISM image processing in Leica Photogrammetry Suite.

Figure 3. Three examples of the check points that belong to the National Trigonometric Network.

Figure 4. Example of the three DSMs derived from the ALOS triplet. Allocation of the check points over the study area in Chalkidiki Peninula, North Greece.

Figure 5. Visual Comparison of the ALOS DSMs and the TOPO50 K DEM over the Chalkidiki Peninsula study area.

Figure 6. Visual Comparison of the ALOS DSMs and the TOPO50 K DEM over the South Chania study area.

Table 2. Elevation difference between check points and the respective pixels in the DSMs (values in meters) for all the study areas.

	RMSE N-F	RMSE N-B	RMSE F-B	RMSE TOPO	RMSE AW3D30
Chalkidiki Peninsula	14.33	17.61	20.58	9.75	5.96
Antiparos	4.77	4.55	6.71	10.63	2.69
Myconos	11.81	11.87	18.06	18.38	6.85
Figalia	11.96	12.74	20.53	15.33	5.40
Thessaloniki	26.51	24.41	26.72	20.14	7.58
Attiki	26.11	24.34	27.84	17.35	12.04
Attiki 2	15.13	14.93	24.17	16.07	9.47
Attiki 3	16.61	17.55	30.85	12.58	8,28
North Chania	31.11	31.02	48.65	27.35	14.42
South Chania	23.66	23.58	52.65	30.07	13.15
Mean RMSE	18.2	18.26	27.676	17.765	8.584