6781097330

45

Estimation of Horizontal Accuracy of the Large-Scale Digital Maps

Table 1. cont.

c Manuał vectorisation of the raster orthophotomap image (monoplotting)	1:2000	C-I	U-311	0.21	1:1000 (700)
		C-II	1-15	0.43	1:2000 (1433)
			11-36	0.42	1:2000 (1400)
			III - 28	0.33	1:1000 (1100)
			IV - 172	0.33	1:1000 (1100)
			V- 130	0.29	1:1000 (966)
			VI-40	0.30	1:1000 (1000)
			VII - 41	0.31	1:1000 (1033)
			Total - 462	0.33	1:1000 (1100)
D Graphical-and-digi-tal processing (manuał vectorisation of raster maps)	1:500	D-l	B - 487	0.36	1:2000 (1200)
			U-514	0.40	1:2000 (1333)
			Total - 1001	0.38	1:2000 (1266)
		D-2	B - 330	0.43	1:2000 (1433)
			U-219	0.48	1:2000 (1600)
			Total - 549	0.45	1:2000 (1500)
		D-3	B - 163	0.45	1:2000 (1500)
			U -77	0.49	1:2000 (1633)
			Total - 240	0.46	1:2000 (1533)
		D-4	B - 105	0.23	1:1000 (766)
			U-131	0.40	1:2000 (1333)
			Total - 236	0.33	1:2000 (1100)
		D-5	B -73	0.31	1:1000 (1033)
			U -61	0.29	1:1000 (966)
			Total - 134	0.30	1:1000 (1000)
		D-6	B -49	0.44	1:2000 (1466)
			U -66	0.34	1:2000 (1133)
			Total - 115	0.39	1:2000 (1300)

Topographic data acąuired from the raster orthophotomap image (developed on a 1:2000 scalę) were highly accurate. As regards the analyzed topographic de-tails, the error of position of a point ranged from 0.21 to 0.43 m. The co-ordinates of the analyzed points of lst group guarantee accuracy on a 1:1000 scalę of the map. The accuracy of a digital map data developed by graphical-and-digital pro-cessing (object D) was within the 0.30-0.50 m rangę. The resulting database may be released (in the form of an analogue map) in presentations whose scalę does not exceed 1:2000.