ncse: Images by category

Purpose of this archiveThis archive was created to offer a more convenient way to find images which represent specific subjects. The subjects belong to a taxonomy developed for the NCSE project – a copy of the taxonomy expressed in SKOS/RDF is included for reference.Note that this archive is not comprehensive. Many small, low-resolution images have been left out, as have numerous duplicates of repeated images used in advertisements or as page ornaments. In several cases the automated process of finding and aggregating images could not match index entry to image (and vice-versa). Contents1. Archive description (this document)2. Five compressed folders containing images from the following journals: a. Leader b. Monthly Repository c. Northern Star d. Publishers Circular e. Tomahawk3. Four index files, comprising two types, and two formats for each type a. category_instance_index.txt b. category_instance_index.xml c. journal_issue_to_image_index.txt d. journal_issue_to_image_index.xml4. Image subject taxonomy fileStructure and contents of compressed folders of journal imagesWhen uncompressed each folder of images has no internal structure and simply contains a collection of image files. The filenames are in the form [EDITION PREFIX][DATE][TYPE&NUMBER][FILETYPE SUFFIX] where[EDITION PREFIX] will be one of the same edition abbreviations found in the main archive for the Journal (e.g. ‘LDR’, ‘CLDR’)[DATE] is date of the issue that contains the image[TYPE&NUMBER] is a combination of a category abbreviation (e.g. ‘Ad’ for advert, ‘Pg’ for page, ‘Pc’ for picture) and a number which refers to the issue page the image occurs on.[FILETYPE SUFFIX] – will be either .jpg or .pngNOTE: the folder for each journal does not contain every graphic image from every issue. This is becausea) there are often multiple instances of a small image (e.g. one that is used in a recurring advertisement)b) it was not always possible to make an automatic match between an index reference and the relevant image fileIndexesThere are two types of index:· category instances – this is structured as a taxonomy of subject types and for each type shows where instances of images manifesting that type occur in journal issues.· journal issues – this lists images that occur in journal issues and for each instance lists what types of subjects the image manifestsEach type of index is provided in both XML format and in plain text.NOTE: the indexes are not comprehensive. There may be images which are not mentioned in the indexes. Conversely, as mentioned above, there may be instances where an image referenced in an index is not present in the compressed image folder. However, the image can still be seen by downloading the main archive for the journal in question and either viewing the relevant PDF file from the compressed folder of PDFs (the quickest and most convenient way, but probably not the highest resolution) or by finding the original image file within the Document.zip file for that issue in the main compressed journal archive file (less convenient but probably better resolution than the PDF version).本档案的宗旨在于提供一种更为便捷的途径，以便寻找代表特定主题的图像。这些主题隶属于为 NCSE 项目所开发的分类体系——其中包含以 SKOS/RDF 表达的分类体系副本，以供参考。请注意，本档案并非全面性，许多分辨率较低的小图像以及广告或页面装饰中重复使用的图像副本已被排除。在若干情况下，自动寻找和汇总图像的过程未能实现索引条目与图像（反之亦然）的匹配。内容概述如下：1. 档案描述（本文件）；2. 五个包含来自以下期刊图像的压缩文件夹：a. 领袖；b. 月度仓库；c. 北极星；d. 出版商圆桌；e. 托马霍克；3. 四个索引文件，包括两种类型，每种类型有两种格式：a. 类别实例索引.txt；b. 类别实例索引.xml；c. 期刊期号至图像索引.txt；d. 期刊期号至图像索引.xml；4. 图像主题分类体系文件。期刊图像压缩文件夹的结构与内容：当解压缩后，每个图像文件夹内部并无结构，仅包含一系列图像文件。文件名格式为[版次前缀][日期][类型&编号][文件类型后缀]，其中[版次前缀]将是主档案中期刊的相同版次缩写之一（例如，'LDR'、'CLDR'等）；[日期]是包含图像的期号；[类型&编号]是类别缩写（例如，'Ad'代表广告，'Pg'代表页面，'Pc'代表图片）与数字的组合，该数字指代图像出现的期号页面；[文件类型后缀]将是.jpg或.png。注意：每个期刊的文件夹并不包含每一期的所有图像。这是因为a) 常常存在多个小图像的实例（例如，在重复广告中使用的图像）；b) 并非总能自动将索引引用与相关的图像文件匹配。索引：存在两种类型的索引：· 类别实例——此结构为主题类型的分类体系，对于每种类型，展示体现该类型的图像实例出现在期刊期号中的位置。· 期刊期号——列出出现在期刊期号中的图像，对于每个实例，列出图像体现的主题类型。每种类型的索引均以XML格式和平文格式提供。注意：索引并非全面性。可能存在未在索引中提及的图像。相反，如上所述，可能存在索引中引用的图像不在压缩图像文件夹中的情况。然而，可以通过下载相关期刊的主档案，从压缩文件夹中的相关PDF文件（最快且最便捷的方式，但可能不是最高分辨率）或通过在主压缩期刊档案文件中找到该期号的Document.zip文件中的原始图像文件（不太方便但可能比PDF版本具有更高的分辨率）来查看图像。