環境保護署 - 策略性環境評估

研究報告

Chapter 4 PRELIMINARY HABITAT MAP

4.2

Methodology

4.2.3

Classification by Existing Data and Aerial Photos

Habitat types not classified with the aid of satellite imagery classification (Section 4.2.2 and Table 4.2c) were mapped by examining existing data sources and by manual interpretation of aerial photos. Data not available in digital form were digitised by hand. The data sources used and the processing steps are summarised in Table 4.2d.

Table 4.2d Habitats Mapped by Existing Data
Habitats	Primary Data Sources	Processing
Fung Shui Forest	Chu (1998) (hardcopy)	Fung Shui coordinates listed in the report were entered and converted to a digital dataset. Fung Shui wood boundaries were digitised on-screen using Lands (1997 1:20K) as a backdrop. Habitat was therefore mapped as either point or area features.
Plantation or Plantation/Mixed Forest	Aerial photos	Manual interpretation of aerial photos.
Fishpond/Gei Wai	Aerial photos, Lands (1997 1:20K, Rivers & Reservoirs), PlanD Fishpond Database(⁹ )	Manual interpretation of the data sources.
Natural Watercourse	Lands (1997 1:20K, Rivers & Reservoirs), Lands (1997 1:1K, Nullah & Stream Course)	Lines were buffered by 2 metres to include riparian zone.
Modified Watercourse	Lands (1997 1:20K, Rivers & Reservoirs), Lands (1997 1:1K, Nullah & Stream Course)	Watercourses identified on hardcopy plot as having straight banks were mapped as modified.
Rocky Shore	Aerial photos, Lands (1997 1:20K) and Lands (1997 1:1K)	Manual interpretation of the data sources. Habitat mapped as line features.
Artificial Rocky/Hard Shoreline	Aerial photos, Lands (1997 1:20K) and Lands (1997 1:1K)	Manual interpretation of the data sources. Habitat mapped as line features.
Intertidal Mudflat	Aerial photos, Lands (1997 1:20K)	Manual interpretation of the data sources. Habitat mapped as line features.
Sandy Shore	Aerial photos, Lands (1997 1:20K) and Lands (1997 1:1K)	Beaches > 20 metres wide were digitised as area features. The habitat was therefore mapped as either line or area features.
Seagrass Bed	Fong (1998a, 1998b), Fong et al (1994), Wu and Lee (1998), SWIMS (1994) and AFCD Herbarium	Hand-drawn maps were digitised on-screen using Lands (1997 1:20K) as backdrop.
Golf Course/Urban Park	Lands (1997 1:20K) and Lands (1998 1:20K) Countryside Map Series (hardcopy)	Habitat identified from Lands (1998 1:20k) Countryside Maps Series and digitised on-screen with Lands (1997 1:20K) as backdrop.
Rural Industrial Storage/Containers	Aerial photos and the Planning Department "Black Spot" database	Data converted to habitat map.

(9) Planning Department's Study of the Ecological Value of Fishponds in the Deep Bay Area.

2005

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最近修訂日期: 二零零五年十二月二十二日