罗洪先,字达夫,号念庵,江西吉安府吉水黄橙溪人,明代学者,地理制图学家。一生奋发于地理学等科学的研究,考图观史,发现当时地图多疏密失准、远近错误,于是亲自外出调查收集资料,准备重新编一内容丰富、地理位置准确的地图,以计里画方之法,创立地图符号图例,绘成《广舆图》。创编成地图集形式,不仅继承了朱思本制图法,还加以发展,使地图更为科学实用,堪称与墨卡托同时代的东方最伟大的地图学家。
罗洪先,祖上世代为官,父亲罗循官至兵部武选郎中,自幼受好良好教育,加之刻苦好学,博闻强识,青少年时对天文、地舆、典章、算术、阴阳等都有深入研究,闻名四方。罗洪先奉父命上京赶考,路上遇见了大儒王阳明的两位弟子黄洛村与何善山。一番交流下来,罗洪先对王阳明崇拜得五体投地,功名利禄之心骤减,当他写信给老家的父亲,表达想要拜王阳明为师的想法后,罗循连回两封信,要儿子用心考科举,其它事放一边。
带着父亲的心愿参加会试,深受嘉靖帝喜欢,被钦点为当科状元,官授翰林院修撰,编写史书。初入官场,自然全心扑在修史上,不想这一修居然引出中国地图史的一段佳话。在考图观史的过程中,罗洪先发现先朝的许多地图或自说自言,或以讹传讹,让人莫衷一是。“如此舆图,如何能作军事参考,如何能流传后世”想到这里,他决定收集比较准确的作品,重新编纂全国性的舆图。
当时,舆图资料大都散落民间,要找到合适的,真心不易,好在功夫不付有心人,在回乡途中偶得朱氏《舆地图》。仔细研究,罗洪先发现与其它舆图相比,朱氏《舆地图》有两个明显优点:一是它坚持用“计里画方”的制图法,精确度很高;二是系统使用了图例符号,更直观更形象。同时,他也发现了此图有两个明显缺点:一是它“长之广尺,不便卷舒”,很难印刷,流传不广;二是图中州县部分比较粗疏,不便于地方上使用。我何不以朱氏《舆地图》为蓝本,沿用计里画方的形式,制成书本式的分幅图册,印刷后大量发行呢”想到这里,他加快了回家的步伐。
罗洪先升为春坊左赞善,在其位谋其政,和同僚唐顺之、赵时春联名上疏,言皇上多病,请太子元旦节上殿接受朝贺。嘉靖帝以为罗洪先三人阴结太子,有不臣之心,遂将他们革职除名,遣回乡里。塞翁失马,焉知非福,无官一身轻的罗洪先坦然回到家中,隐居石莲洞,一边寻求王阳明的学问,一边研究舆图资料,稍有空闲就外出考察,经过一年多时间的集中编撰,终于完成了一部以朱氏《舆地图》为蓝本的地图集——《广舆图》。从最初寻找舆图到完成图集,前后整整花了十年。
作为我国现存最早的分省地图集,《广舆图》所载除明代全国行政疆域总图外,共43幅:两京、十三个布政使司共15幅,北方边疆10幅,黄河图3幅,海运图2幅,安南、朝鲜、西域图3幅等。这种以省区为单位分划制图的创新方式为后世所借鉴,分省绘图的背面附有相应的沿革、风俗、所辖范围和计征田赋数字等。据载,罗洪先在编印过程中还使用了先进的技术,省区方位精确度高,山脉、海岸、居民点等要素的相对位置都接近现代地图。
此外,罗洪先首创了24种新式的图例,开创了系统使用图例的制图方法,从而使《广舆图》看起来一目了然,易懂好查,图集醒目地标出长城、陵墓、桥梁等古迹,可谓早期的旅游地图集。事实证明,罗洪先改编朱氏《舆地图》的思路完全正确。一方面,由于他在发扬朱氏《舆地图》优良传统的基础上进行创新,所以直到今天还能看到朱氏《舆地图》的某些原貌。另一方面,作为明代影响最大的地图作品之一,《广舆图》在明清两朝六次被公开刊印,广为流传。
完成《广舆图》后,一直隐居家乡的石莲洞,过着异常艰难而简陋的生活,睡的是石床,喝的是稀粥,收到官复原职的同僚唐顺之、赵时春等来信后,一一拒绝复出任职。罗洪先淡泊明志,研究王阳明心学的同时,不忘修订《广舆图》,直到逝世。
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