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Electronic Navigation Systems 3E Episode 9

Tham khảo tài liệu 'electronic navigation systems 3e episode 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Electronic charts 229 KEY arcs I ABRAHAM REPROMAT NEW EDITION NEW CHART SCAN r RECTIFY Projection T CLEAN I UPDATE I VERIFY PROOF TRANSFER BASES to Chart Branch COMPILE I VERIFY PROOF I RETURN BASES COMPILE _ I VECTOR DIGITISE __ 1 _ VECTOR to RASTER I VERIFY PROOF NM COMBINE BASES COMBINE BASES COMBINE bases Í27rtpí . I27ipi ATE spccifi REPLICATE ISSUE IỜSTOC 7RTNM. TON TILES iour arcs FuU Colour NTM V CORRECT BASES VERIFY PROOF COMBINE BASES CHARTS databank WoBochrome Chait Bases LSR Formal - 1016dpi ESCHERGRAD PRINT ISSUE ló STOCK Base Maintenance IDENTIFY CHARTS PAPER CHART AREA CD-ROM UPDATE CD-ROM Figure 7.1 ARCS ABRAHAM production system. Reproduced with the permission of the Controller of HMSO and the United Kingdom Hydrographic Office. 230 Electronic Navigation Systems Figure 7.2 Regional coverage of ARCS CD-ROMs. Reproduced with the permission of the Controller of HMSO and the United Kingdom Hydrographic Office. month but the schedule varies according to the number of corrections outstanding and the number of chart CDs in stock. Monthly. Cross-checks are carried out against the data held on the Sales Order Processing System and the Chart Information System CIS . The UKHO provides a near worldwide coverage with 2700 charts available as ARCS CD-ROMs. The regional coverage of these charts is shown in Figure 7.2. Table 7.1 gives a comparison between the BSB and ARCS raster types. 7.2.3 Electronic navigational charts ENC These are the designated charts for the ECDIS system and they possess a single universal data format. Such charts use vector data based on the IHO Special Publication S-57 edition 3 IHO Transfer Standard for Digital Hydrographic Data. Some of the major points which identify the unique property of these charts are as follows. They are issued by or on the authority of a government-authorized hydrographic office. Items on the chart must be attribute-coded and must be able to be interrogated to provide information. Electronic charts 231 Table .