Lou Holt December 26, 2020 Map
Fire Insurance Maps During the late nineteenth and early twentieth centuries, fire insurance maps were periodically drawn up for cities and towns in the United States. These maps were commissioned by insurance companies in order to more accurately calculate fire risk, depicting the layout of the town and showing each existing building. The maps offer a great deal of information, and can show the outline of the building, the building material, the number of stories, doors, windows and chimneys, the address and lot lines, street widths, water pipes, hydrants and cisterns. The Sanborn Company was the largest, but not the only, fire insurance mapping firm. The Sanborn Company was founded in 1867, and created fire insurance maps from 1867 until 1969.
Plat Maps A plat map is a plan of an area which shows the legal boundaries and dimensions of each parcel of land. These maps can usually be found at your local city or county government center. Check for the property owners of your parcel of land on each of the plat maps you locate. Street Maps These maps can help identify when the street you are researching was created. It is not uncommon to find that the street name has changed over time. Check with your local municipality for the existence of old street maps. Many city directories actually contain a street map that provides details on the streets covered by the directory. Comparing these maps with current maps can help to pinpoint street names that have been changed. Libraries typically have copies of city directories at their facilities.
Map projections are classified based on: Distortion characteristics: Some projections often need to show a particular area or its relative size accurately for distributions or other phenomena. These are called equivalent or an equal area projection. The Lambert Azimuthal projection that maps a sphere to a disk, and accurately shows all regions of the sphere is an example of this category. However, this equal area projection fails to represent angles with accuracy. The Albers projection is another instance of equal area map projection that utilizes two standard parallels. Despite no preservation of scale and shape, the distortion in this case is found to be minimal between the standard parallels.
Internal cross links between lower level keywords are less common in mind maps and concept maps than they are in association maps, with the branching tree structure tending to take precedence. With concept and mind maps, the relationship of each word to the overarching theme remains paramount. In association maps, however, the link becomes the key, and, as stated, the process of deciding which type of link joins keywords together is a valuable part of ascertaining correct understanding. If you cant link two keywords effectively, you havent understood how they are related to one another! This pairing and linking process allows a jigsaw like approach to the development of the knowledge map, and enables a student always to be working from a point of understanding. Most interestingly, when used to develop a map for a new topic where one is not an expert, it is possible to identify the high level terms which will take precendence at the top of a concept map once an association map has been developed. This is because they are the ones with the most linkages. Development of an association map therefore gives a useful mechanism for allowing students to take on the expert role and develop their own concept maps, even when they are not fully confident in a subject. Drawing any of the three types of maps involves much more active learning than just using ready produced ones in my experience so this is a definite bonus. In summary, all mapping techniques provide a powerful method for organising key ideas within a topic or sub-topic. Mind mapping allows colourful creativity, concept mapping provides the confidence of professional correctness, and association mapping always lets you get started somewhere, but I have a sneaky suspicion, that the real power of visual mapping is the process your brain goes through when you develop those non-verbal links for yourself, so get a pencil and get started!
Here are a few ways for you to spot a fake old map: 1. Color maps were hand-colored before the 1850s. With a magnifying glass take a close look at the color. If you see a matrix of small and even overlapping dots then you have a map made after the 1900s. Your map may say it is from the 1600s for example, but the presence of these dots means that it was not made until after the 1900s. Its a copy. 2. Old maps were mostly engraved on metal plates in reverse so that they could be printed. When printing the pressure from the press and its engraved plate into the paper leaves a "plate mark" or indentation around the map. If you have a plate mark on your map be sure to look all the way around to see if anything was printed beyond the plate mark. If there is printed material spilling beyond the plate mark, you have a fake.
There are other options worth knowing about: firstly the Active Maps which come in both Landranger and Explorer ranges and have a laminated, waterproof cover to protect your map from the rain and elements when out and about; secondly there are the custom-made maps which allow you to choose where the centre of your map will be. These are particularly handy if the route you want to follow will require buying 2 or more maps or you want maps of the countryside surrounding one central point on all sides e.g. the area around a campsite or accommodation or even your house! Both types of map are more expensive than basic OS Explore and OS Landranger maps. Check your whole walk area is covered: Select the type of map you require and then check on the map detail that your whole route is covered. The last thing you want is to realise that half your intended route is missing when you set off for your walk! If necessary you will need to get additional maps for adjoining areas. Each map has a number in the top right hand corner of the cover which along with the name is the reference you will need to select the correct map to purchase.