Cartographic Accuracy Standard (CAS) of the digital terrain model of the digital and continuous cartographic base of the state of Amapá: case study in the city of Macapá

Santos Filho, Herondino dos; Cornero, Cecilia; Pereira, Ayelen; Nero, Marcelo

doi:10.1590/s1982-21702022000300017

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ORIGINAL ARTICLE • Bol. Ciênc. Geod. 28 (03) • 2022 • https://doi.org/10.1590/s1982-21702022000300017 copy

Cartographic Accuracy Standard (CAS) of the digital terrain model of the digital and continuous cartographic base of the state of Amapá: case study in the city of Macapá

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract:

The Cartographic Accuracy Standard (CAS) is a quality parameter used by the Brazilian standard to estimate the positional quality of cartographic products in their degree of precision, also including altimetry. The Digital and Continuous Cartographic Base of Amapá - BCDCA has a large amount of freely available spatial information, for the study of its territory within the state of Amapá. This project, a partnership between the Government of the State of Amapá and the Directorate of Geographical Services of the Brazilian Army (DSG), obtained a large amount of SAR data by interferometry. Among the resulting products, the Digital Terrain Model - DTM has a wide range of applications: watershed analysis, infrastructure program, diagnosis of environmental risks and so many others. Therefore, the present work aims to evaluate the altimetric data (DTM) provided by the BCDCA through 2172 orthometric points calculated from the Brazilian Network for Continuous Monitoring - RBMC measured in the field in the city of Macapá, capital of the State of Amapá. For the level curves, the results presented class A for the 1: 10 000 scale, at an equidistance of 5 m, showing that the DTM product is highly reliable for urban applications.

Keywords:
CAS; DTM; Cartographic base; Macapá; RBMC

Description	Specification
Product scale	1:25 000
DTM pixel dimension (m)	2.5 m x 2.5 m
Superposition of lines in Range	>= 66%
Superposition of lines in Azimuth	>=5 km
Swath	14 km
Flight height	19 000 to 25 000 ft
Average speed	360 km / h
Radiometry of the digital model	32 bits
P-band resolution	2.5 m
Maximum length of flight line	<=220 km
DTM Altimetric Accuracy (P Band)	In open areas: standard deviation 3.33 m (Class A for scale 1: 25 000, according to the old CAS).
DTM Altimetric Accuracy (P Band)	In areas with dense vegetation: standard deviation 4.56 m (Class C for scale 1: 25 000, according to the old CAS).
DTM Planimetric Accuracy	<= 7.5 m PEC class A
Geoid	MAPGEO 2010
Horizontal Datum	SIRGAS 2000
Projection	UTM

CAS-DCS		A	B	C	D
1 : 1000 (Eqd=1 m)	CAS (m)	0.50	0.60	0.75	1.00
1 : 1000 (Eqd=1 m)	SE (m)	0.33	0.40	0.50	0.60
1 : 2000 (Eqd=1 m)	CAS (m)	0.50	0.60	0.75	1.00
1 : 2000 (Eqd=1 m)	SE (m)	0.33	0.40	0.50	0.60
1 : 5000 (Eqd=2 m)	CAS (m)	1.00	1.20	1.50	2.00
1 : 5000 (Eqd=2 m)	SE (m)	0.67	0.80	1.00	1.20
1 : 10 000 (Eqd=5 m)	CAS (m)	2.50	3.00	3.75	5.00
1 : 10 000 (Eqd=5 m)	SE (m)	1.67	2.00	2.50	3.00
1 : 25 000 (Eqd=10 m)	CAS (m)	5.00	6.00	7.50	10.00
1 : 25 000 (Eqd=10 m)	SE (m)	3.33	4.00	5.00	6.00
1 : 50 000 (Eqd=20 m)	CAS (m)	10.00	12.00	15.00	20.00
1 : 50 000 (Eqd=20 m)	SE (m)	6.67	8.00	10.00	12.00
1 : 100 000 (Eqd=50 m)	CAS (m)	25.00	30.00	37.50	50.00
1 : 100 000 (Eqd=50 m)	SE (m)	16.67	20.00	25.00	30.00
1 : 250 000 (Eqd=100 m)	CAS (m)	50.00	60.00	75.00	100.00
1 : 250 000 (Eqd=100 m)	SE (m)	33.33	40.00	50.00	60.00

CAS-DCS		A	B	C	D
1 : 1000 (Eqd=1 m)	CAS (m)	0.27	0.50	0.60	0.75
1 : 1000 (Eqd=1 m)	SE (m)	0.17	0.33	0.40	0.50
1 : 2000 (Eqd=1 m)	CAS (m)	0.27	0.50	0.60	0.75
1 : 2000 (Eqd=1 m)	SE (m)	0.17	0.33	0.40	0.50
1 : 5000 (Eqd=2 m)	CAS (m)	0.54	1.00	1.20	1.50
1 : 5000 (Eqd=2 m)	SE (m)	0.34	0.66	0.80	1.00
1 : 10 000 (Eqd=5 m)	CAS (m)	1.35	2.50	3.00	3.75
1 : 10 000 (Eqd=5 m)	SE (m)	0.84	1.67	2.00	2.50
1 : 25 000 (Eqd=10 m)	CAS (m)	2.70	5.00	6.00	7.50
1 : 25 000 (Eqd=10 m)	SE (m)	1.67	3.33	4.00	5.00
1 : 50 000 (Eqd=20 m)	CAS (m)	5.50	10.00	12.00	15.00
1 : 50 000 (Eqd=20 m)	SE (m)	3.33	6.66	8.00	10.00
1 : 100 000 (Eqd=50 m)	CAS (m)	13.70	25.00	30.00	37.50
1 : 100 000 (Eqd=50 m)	SE (m)	8.33	16.66	20.00	25.00
1 : 250 000 (Eqd=100 m)	CAS (m)	27.00	50.00	60.00	75.00
1 : 250 000 (Eqd=100 m)	SE (m)	16.67	33.33	40.00	50.00

Parameters	Values
Mean error	0.005
Mean Square Error	1.972
Mean percentage error	6.575
Pearson’s coefficient	0.952
Determination coefficient	0.906
Standard Error (SE)	1.404

Class	BCDCA
A	2.50
B	3.00
C	3.75

Class	Eqd = 5 m (1:10 000)	Eqd = 10 m (1:25 000)
A	1.35	2.70
B	2.50	5.00
C	3.00	6.00
D	3.75	7.50

Parameters	Orthometric-normal	Normal (MAPGEO2010)	Normal (MAPGEO2015)
Mean error	0.0050	0.0062	0.0006
Mean Square Error	1.9728	1.9696	1.9711
Mean percentage error	148.1299	220.7127	24.3895
Pearson’s coefficient	0.9519	0.9524	0.9521
Determination coefficient	0.9063	0.9072	0.9066
Standard Error (SE)	1.4045	1.4034	1.4040

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E-mail: bcg_editor@ufpr.br

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[TFN1] Source: BCDCA