Agricultural Land Classification detailed Post 1988 survey ALCB02490a

Survey name: Penzance, Heliport
Post 1988 Agricultural Land Classification (ALC) site survey data – scanned original paper maps and survey reports for individual sites surveyed in detail between 1989 and 1999 by the Ministry of Agriculture Fisheries and Food. Where Grade 3 is mapped this includes the subdivision of Grade 3 into subgrades 3a and 3b. Surveys use the current grading methodology as described in "Agricultural Land Classification of England and Wales. Revised guidelines and criteria for grading the quality of agricultural land (MAFF, 1988)":http://webarchive.nationalarchives.gov.uk/20130402151656/http:/archive.defra.gov.uk/foodfarm/landmanage/land-use/documents/alc-guidelines-1988.pdf. Individual sites have been mapped at varying scales and level of detail from 1:5,000 to 1:50,000 (typically 1:10,000). Unedited sample point soils data and soil pit descriptions are also available for some surveys.
Attribution statement: © Natural England copyright. Contains Ordnance Survey data © Crown copyright and database right [year].

调查名称：彭赞斯，直升机停机坪
1988年以后的农业用地分类（ALC）场地调查数据——对1989年至1999年间由农业、渔业与食品部详细调查的各个场地扫描的原始纸质地图和调查报告。当绘制至三级时，包括三级细分为三级a和三级b的子等级。调查采用了在《英格兰和威尔士农业用地分类。修订后的分级指导方针和农业用地质量分级标准（MAFF，1988）》中描述的当前分级方法：[http://webarchive.nationalarchives.gov.uk/20130402151656/http:/archive.defra.gov.uk/foodfarm/landmanage/land-use/documents/alc-guidelines-1988.pdf](http://webarchive.nationalarchives.gov.uk/20130402151656/http:/archive.defra.gov.uk/foodfarm/landmanage/land-use/documents/alc-guidelines-1988.pdf)。各个场地的制图比例和详细程度不一，从1:5,000至1:50,000（通常为1:10,000）不等。部分调查还提供了未经编辑的样本点土壤数据和土壤坑描述。
致谢声明：© 自然英格兰版权所有。包含测量局的地图数据，版权属于皇家版权和数据库权利[年份]。